Webster's New World Medical Dictionary

in vitro fertilization
A laboratory procedure in
which sperm are put in a special dish with unfertil-
ized eggs to achieve fertilization. The embryos that
result can be transferred into the uterus or frozen
(cryopreserved) for future use. Abbreviated IVF.
in vivo
In the living organism. For example, an
experiment that is done in vivo is done in the body
of a living organism as opposed to in a laboratory
method that does not use the living organism as the
host of the test. In vivo is the opposite of in vitro.
immunohistochemistry
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inactivated polio vaccine
See 
polio immu-
nization; polio vaccine, inactivated.
inappropriate ADH secretion
See 
ADH secre-
tion, inappropriate.
inborn error of metabolism
A heritable disor-
der of the biochemistry of the body. Examples of
inborn error of metabolism include albinism and
phenylketonuria (PKU). There are hundreds of
known inborn errors of metabolism. See also
albinism; cystinuria; phenylketonuria.
inbreeding
See 
consanguinity.
incest
Sexual activity between individuals so
closely related that marriage is legally prohibited.
Incest involving a child is a form of child abuse.
inch
A length equivalent to one-twelfth of a foot,
one-thirty-sixth of a yard, or 2.54 cm. Abbreviated
in.
incidence
The frequency with which something,
such as a disease or trait, appears in a particular
population or area.
incision
A cut that is purposely made. When
making an incision, a surgeon is making a cut.