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MedTerms Medical Dictionary A-Z List - I: Detailed Datasheet
Medically reviewed by Min Clinic Staff | Updated: January 2026
Ia-IlIm-ImIn-InIo-IsIt-Iz
IIa-Il
- i(17q)
- Iatr-
- Iatrapistic
- Iatric
- iatrics
- Iatrogenic
- Iatromelia
- Iatromisia
- iatry
- IAVI
- IBD (inflammatory bowel disease)
- IBS (irritable bowel syndrome)
- Ibuprofen
- ICD
- Ice cream headache
- Ichthyosis
- Ichthyosis simplex
- Ichthyosis vulgaris
- Ichthyosis, spasticity, oligophrenia syndrome
- Ichthyosis-keratitis-deafness syndrome
- ICSI
- Icterus
- ICU
- ICU psychosis
- ID
- IDEC-Y2B8 monoclonal antibody
- IDET
- Idiocy, amaurotic familial
- Idiopathic
- Idiopathic nephrotic syndrome of childhood
- Idiopathic pulmonary arterial hypertension
- Idiopathic pulmonary fibrosis
- Idiopathic sclerosing cholangitis
- Idiopathic scoliosis
- Idiopathic thrombocytopenic purpura
- Idiopathy
- Idiot savant
- IFA
- Ig
- IgA
- IgA Nephropathy (Berger's Disease)
- IgD
- IgE
- IgG
- IgM
- IGT
- IHS
- IL-1
- IL-10
- IL-2
- IL-4
- Ile
- Ileal pouch
- Ileitis, Crohn
- Ileitis, terminal
- Ileocolitis, Crohn
- Ileoscopy
- Ileostomy
- Ileum
- Ileus
- Ileus, meconium
- Ileus, paralytic
- Iliac
- Iliac horns
- Iliopsoas muscle
- Ilium
- Illness, acute
- Illness, altitude
- Illness, chronic
- Illness, heat-related
- Illusion
IIm-Im
- IM (intramuscular)
- Imagery
- Imbibe
- Imbricate
- Imitrex
- Immune
- Immune complex
- Immune response
- Immune system
- Immune thrombocytopenic purpura
- Immune tolerance
- Immunity
- Immunity, acquired
- Immunity, active
- Immunity, innate
- Immunity, natural
- Immunity, passive
- Immunization
- Immunization, anthrax
- Immunization, chickenpox
- Immunization, children's
- Immunization, DPT
- Immunization, DT
- Immunization, DTaP
- Immunization, flu
- Immunization, German measles
- Immunization, H. flu
- Immunization, Haemophilus influenzae type B (HIB)
- Immunization, hepatitis A
- Immunization, hepatitis B
- Immunization, HIB
- Immunization, infectious hepatitis
- Immunization, influenza
- Immunization, measles
- Immunization, meningococcal
- Immunization, MMR
- Immunization, mumps
- Immunization, pneumococcal
- Immunization, polio
- Immunization, rubella
- Immunization, serum hepatitis
- Immunization, Td
- Immunization, varicella
- Immunization, yellow fever
- Immunocompetence
- Immunocompetent
- Immunocompromised
- Immunocow
- Immunodeficiency
- Immunodeficient
- Immunodepressant
- Immunodepression
- Immunogenetics
- Immunoglobulin
- Immunoglobulin A
- Immunoglobulin D
- Immunoglobulin E
- Immunoglobulin G
- Immunoglobulin M
- Immunologist
- Immunology
- Immunopig
- Immunosuppressant
- Immunosuppression
- Immunosuppressive
- Immunosuppressive agent
- Immunotherapy
- Immunotherapy, allergy
- Immunotoxin
- Impact
- Impaction, dental
- Impaired glucose tolerance
- Imperforate anus
- Impetigo
- Implant
- Implant, brainstem
- Implant, cochlear
- Implantable cardiac defibrillator
- Implantable pacemaker
- Implantation
- Implantation, seed
- Implicit memory
- Impotence
- Imprinting, genomic
- Imprinting, psychological
- Impulsivity
- IMRT
IIn-In
- in
- In situ
- In situ hybridization
- In situ hybridization, fluorescent
- In situ, carcinoma
- In vitro
- In vitro fertilization
- In vivo
- In-law
- In-the-canal hearing aid
- In-the-ear hearing aid
- Inactivation, X chromosome
- Inappropriate ADH secretion
- Inborn error of metabolism
- Inbreeding
- Inbreeding, coefficient of
- Incase
- Incest
- Inch
- Incidence
- Incision
- Incisional biopsy
- Incompatibility, Rh
- Incompetent cervix
- Inconclusive clinical trial
- Incontinence
- Incontinence of urine
- Incontinence, fecal
- Incontinence, rectal
- Incontinence, urge
- Incontinence, urinary
- Incontinent
- Incontinentia pigmenti
- Incubation period
- Incubator
- Incurable
- Incus
- Index case
- Index, body mass (BMI)
- Indian Health Service (IHS)
- Indian meal moth
- Indicate
- Indication
- Indifferent gonad
- Indirect immunofluorescence assay
- Indolent lymphoma
- Induced abortion
- Induced disease by proxy
- Induced menopause
- Induction therapy
- Induration
- Industrial health
- Indwelling bladder catheter
- Infant
- Infant carbohydrate intake
- Infant fat requirements
- Infant formula
- Infant in swaddling
- Infant iron supplementation
- Infant mineral requirements
- Infant mortality rate
- Infant protein requirements
- Infant vitamin requirements
- Infant water requirements
- Infant, post-term
- Infant, postmature
- Infant, small for gestational age
- Infantile beriberi
- Infantile genetic agranulocytosis
- Infantile hypothyroidism
- Infantile myxedema
- Infantile paralysis (polio)
- Infantile spasms
- Infantile systemic hyalinosis
- Infantile thiamine deficiency
- Infantile vitamin B1 deficiency
- Infantilism, Brissaud's
- Infarct
- Infarction
- Infarction, acute myocardial
- Infection
- Infection, acute HIV
- Infection, adenovirus
- Infection, breast
- Infection, ear (acute middle)
- Infection, group B strep
- Infection, hospital-acquired
- Infection, Leishmania
- Infection, meningococcal
- Infection, middle ear
- Infection, Neisseria
- Infection, nosocomial
- Infection, opportunistic
- Infection, pinworm
- Infection, pork tapeworm
- Infection, primary HIV
- Infection, rotavirus
- Infection, roundworm
- Infection, urinary tract (UTI)
- Infection, Vincent
- Infection, yeast
- Infectious Diseases, Nat'l Institute of Allergy &
- Infectious hepatitis
- Infectious hepatitis immunization
- Infectious mono
- Infectious mononucleosis
- Infectivity
- Inferior
- Inferior vena cava
- Inferolateral
- Infertile
- Infertility
- Infertility, Y chromosome
- Infiltrate
- Infiltrating ductal carcinoma of the breast
- Infiltrating lobular carcinoma of the breast
- Inflammation
- Inflammation, bladder
- Inflammatory bowel disease
- Inflammatory response
- Influenza
- Influenza vaccination priorities
- Influenza, Asian
- Influenza, avian
- Influenza, Hong Kong
- Influenza, Spanish
- Informatics
- Informed consent
- Infraspinatus muscle
- Infuse
- Ingelfinger rule
- Ingrown hair
- Ingrown toenail
- Inguinal
- Inguinal canal
- Inguinal orchiectomy
- Inhalant
- Inhaler, metered-dose
- Inheritance
- Inheritance, holandric
- Inheritance, mendelian
- Inheritance, mitochondrial
- Inheritance, multifactorial
- Inheritance, Y-linked
- Inherited immunodeficiency disease
- Inherited metabolic diseases
- Inhibin
- Inhibition, orgasmic
- Inhibitor, ACE
- Inhibitor, protease
- Inhibitory RNA
- Iniencephaly
- Injection snoreplasty
- Injure
- Injury
- Injury, cold
- Injury, hangman (Hangman's fracture)
- Injury, knee meniscus
- Injury, mental child
- Injury, mower
- Injury, needlestick
- Injury, scooter
- Inkblot test
- Innate immunity
- Inner ear
- Inner ear infection
- Innervate
- Innervation
- Inotropic
- Inpatient
- INR
- Insect sting
- Insecticidal
- Insecticide
- Insecticide-treated bednet
- Insemination
- Insemination, artificial
- Insemination, heterologous
- Insemination, homologous
- Insemination, intrauterine
- Insertable loop recorder
- Insertion
- Insinuate
- Insomnia
- Insomnia, chronic
- Insomnia, fatal familial
- Insomnia, intermittent
- Insomnia, transient
- Inspissate
- Institute of Medicine
- Institute on Deafness and Communication Disorders
- Institute, National Eye (NEI)
- Institutional Review Board
- Insufficiency, aortic
- Insufficiency, coronary
- Insufficiency, mitral
- Insufficiency, pancreatic
- Insufficiency, pulmonary
- Insufficiency, respiratory
- Insufficiency, small intestine
- Insular sclerosis
- Insulin
- Insulin pump
- Insulin resistance
- Insulin resistance syndrome
- Insulin-dependent diabetes
- Insulinoma
- Integrin
- Integron
- Intelligence quotient
- Intelligence test
- Intelligence, non-verbal
- Intelligence, verbal
- Intensity modulated radiation therapy
- Intensive Care
- Intensive care unit psychosis
- Intensivist
- Interatrial septum
- Intercellular
- Intercellular junction
- Intercostal muscle
- Intercurrent disease
- Interferon
- Interleukin-1
- Interleukin-10
- Interleukin-2
- Interleukin-3
- Interleukin-4
- Interleukins
- Intermediate-grade lymphoma
- Intermittent claudication
- Intermittent insomnia
- Intern
- Internal bleeding
- Internal cardiac defibrillator
- Internal carrier
- Internal ear
- Internal fixation
- Internal genitalia, female
- Internal genitalia, male
- Internal jugular vein
- Internal medicine
- Internal pacemaker
- Internal radiation therapy
- International AIDS Vaccine Initiative
- International normalized ratio
- International unit (IU)
- Interneuron
- Internist
- Interpersonal therapy
- Interphase
- Intersex
- Intersexual genitalia
- Interstice
- Interstitial
- Interstitial cystitis (IC)
- Interstitial radiation
- Interstitial radiation therapy
- Intertrigo
- Interval malignancy
- Intervening sequence
- Intervention
- Interventional
- Interventional radiologist
- Interventional radiology (IR)
- Interventricular foramen
- Interventricular septum
- Intervertebral disk
- Intervertebral foramen
- Intestinal gas
- Intestinal obstruction
- Intestinal parasite
- Intestinal pseudo-obstruction
- Intestinal villus
- Intestine
- Intestine, large
- Intestine, small
- Intolerance, food
- Intolerance, lactose
- Intra-arterial pressure
- Intracellular
- Intracerebral hematoma
- Intracorneal Ring Segments
- Intracorporeal
- Intracranial
- Intracranial hematoma
- Intractable
- Intracytoplasmic sperm injection (ICSI)
- Intradermal
- Intradiskal electrothermal therapy
- Intraductal carcinoma
- Intraductal papilloma
- Intraepithelial
- Intrafallopian
- Intrahepatic
- Intramuscular (IM)
- Intraocular
- Intraocular lens
- Intraocular melanoma
- Intraocular pressure
- Intraocular tension
- Intraoperative
- Intraoperative blood salvage
- Intraoperative radiation therapy
- Intraoral
- Intraperitoneal
- Intraperitoneal chemotherapy
- Intrastromal corneal ring
- Intrathecal chemotherapy
- Intrauterine
- Intrauterine contraceptive device (IUD)
- Intrauterine growth restriction
- Intrauterine growth retardation
- Intrauterine insemination (IUI)
- Intravenous (IV)
- Intravenous cholangiogram
- Intravenous feeding
- Intravenous immunoglobulin
- Intravenous pyelogram
- Intravenous tension
- Intraventricular
- Intravitreal Injection for Wet AMD
- Intravitreous
- Intrinsic
- Introitus
- Introitus, facial canal
- Introitus, vaginal
- Intron
- Intubate
- Intubation
- Intussusception
- Inuit health
- Invasive candidiasis
- Invasive cervical cancer
- Inverse psoriasis
- Inversion, chromosome
- Inversion, paracentric chromosome
- Inversion, pericentric chromosome
- Invert
- Inverted repeat
- Invest
- Involuntary
- Involuntary smoking
- Involute
- Involution
IIo-Is
- Iodide
- Iodide goiter
- Iodine
- Iodine deficiency
- Iodine excess
- Iodine, radioactive
- Ion channel
- Iontophoresis
- IOP (intraocular pressure)
- Ipecac
- Ipsilateral
- IPT
- IPV
- IQ
- IRB
- Iridectomy
- Iridectomy, peripheral
- Iridology
- Iris
- Iris melanoma
- Iris, speckled
- Iritis
- Iron
- Iron deficiency anemia
- Iron excess
- Iron overload
- Iron poisoning
- Iron supplementation, infant
- Irradiation
- Irradiation, food
- Irrigate
- Irrigation of the colon
- Irritable bowel syndrome (IBS)
- Irritant contact dermatitis
- Irwin DJ Bross
- Ischemia
- Ischial bursitis
- Ischium
- Islet cell cancer
- Islet cell carcinoma
- Islet cell tumor
- Islets of Langerhans
- Iso-
- Isocellular
- Isochromosome
- Isochromosome 17q
- Isodisomy
- Isoflavone
- Isoform
- Isolate
- Isoleucine
- Isometric exercise
- Isometropia
- Isoprene
- Isotonic exercise
- Isotonic solution
- Isotope
- Isotopic
IIt-Iz
- Italian disease
- ITC
- Itch, jellyfish
- Itch, ocean
- Itch, seabather's
- Itching
- Itching, anal
- Itchy ear
- ITE
- itis
- ITN
- ITP
- IU (international unit)
- IUD (intrauterine contraceptive device)
- IUGR
- IV (intravenous)
- IV cholangiogram
- IVC
- IVF