Webster's New World Medical Dictionary

inhibitor, protease
See 
protease inhibitor.
injury, cold
See 
cold injury.
inner ear
See 
ear, inner.
INR
International normalized ratio.
insect sting
A sting from a stinging insect, such
as a bee, hornet, yellow jacket, or wasp, that can
trigger allergic reactions. These reactions vary
greatly in severity. Avoidance and prompt treatment
are essential. In selected cases, allergy injection
therapy is highly effective.
insemination
The deposition of semen in the
female reproductive tract. With sexual intercourse,
the deposit is made within the vagina or the cervix.
By artificial means, such as intrauterine insemina-
tion, the deposit can be made directly into the
uterus.
insemination, artificial
See 
artificial 
insemination.
insemination, heterologous
See 
artificial
insemination by donor.
insemination, homologous
See 
artificial
insemination by partner.
insemination, intrauterine
See 
artificial
insemination.
insertion
A chromosome abnormality that is due
to insertion of a segment from one chromosome
into another chromosome.
insomnia
The perception or complaint of inade-
quate or poor-quality sleep due to a number of fac-
tors, such as difficulty falling asleep, waking up
frequently during the night with difficulty returning to
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insomnia
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sleep, waking up too early in the morning, or unre-
freshing sleep. Insomnia is not defined by the num-
ber of hours of sleep a person gets or how long it
takes to fall asleep; it is a measure of satisfaction with
sleep. Individuals vary normally in their need for and
their satisfaction with sleep. Insomnia may cause
problems during the day, such as tiredness, a lack of
energy, difficulty concentrating, and irritability.