Webster's New World Medical Dictionary

Institute of Medicine
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intermittent claudication
See 
claudication,
intermittent.
intern
In medicine, a physician who has com-
pleted medical school and is engaged in the first
year of postgraduate medical training (residency).
internal cardiac defibrillator
See 
cardiac
defibrillator, implantable.
internal ear
See 
ear, inner.
internal genitalia, female
See 
genitalia.
internal jugular vein
The deeper of the two
jugular veins in the neck that drain blood from the
head, brain, face, and neck, and then convey it
toward the heart. The internal jugular vein runs
down the inside of the neck, outside the internal
and common carotid arteries, and unites with the
subclavian vein to form the innominate vein. See
also 
jugular vein, internal.
internal medicine
The medical specialty dedi-
cated to the diagnosis and medical treatment of
adults. A physician who specializes in internal med-
icine is referred to as an internist. Subspecialties of
internal medicine include allergy and immunology,
cardiology (heart diseases), endocrinology (hor-
mone disorders), hematology (blood disorders),
infectious diseases, gastroenterology (diseases of the
gut), nephrology (kidney diseases), oncology (can-
cer), pulmonology (lung disorders), and rheumat-
ology (arthritis and musculoskeletal disorders).
internal pacemaker
See 
pacemaker, internal.
internal radiation therapy
See 
radiation ther-
apy, internal.