Dictionary of Medical Terms

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All terms that start with the letter I

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iatrogenic

Resulting from medical treatment.
ichthyosis

An inherited skin disorder that produces dry, rough, scaly skin.
identical twins

Twins formed from a single egg. They are of the same gender and have the same genetic makeup. Also called…
idiopathic

Without a known cause.
ileitis

Inflammation of the lower part of the small intestine.
ileum

The lower part of the small intestine.
ileus

Lack of movement of digested food and juices through the gastrointestinal tract. May be due to a blockage of the…
ilium

The flared portion of the pelvis. The hip bone.
IM

Intramuscular.
immune

Resistant to a particular disease.
immunity

Resistance of the body to infection.
immunization

The process of making an individual immune by vaccination or inoculation.
immunoglobulin

A serum protein involved in immunity. An antibody.
impetigo

Skin infection characterized by erupting sores. Caused by staphylococcus or streptococcus bacteria.
impotence

Inability of a male to achieve erection and orgasm.
in situ

In its original place. Carcinoma in situ means cancer that hasn’t spread to other locations.
incision

A cut.
incisor

Any of the front four teeth on either the upper or lower jaw.
incompetent

1. Unable to make rational decisions. 2. Not functioning properly.
incontinence

Inability to hold urine or feces.
incubate

To provide the proper conditions for growth.