Impregnation—The act of producing.
Incision—The cutting with instruments.
Incontinence—Not being able to hold the natural secretions.
Influenza—A disease affecting the nostrils and throat.
Infusion—The liquor in which plants have been steeped, and their medicinal virtues extracted.
Inhalation—Drawing in the breath.
Injection—Any preparation introduced into the rectum or other cavity by syringe.
Inspiration—The act of drawing air into the lungs.
Insomnia—Sleeplessness.
Involuntary—Against the will.