Induration.—Hardening.
Infusoria.—Microscopic insects.
Insomnia.—Sleeplessness.
Integument.—Skin.
Intra-uterine.—Within the uterus.
Introversion.—Turned within.
Ipecacuanha.—Ipecac.
Labia.—The lips of the vagina.
Laxative.—Remedy increasing action of the bowels.
Liquor Amnii.—Secretion in which the fetus floats.