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Myotic.—Any agent that contracts the pupil of the eye, whether applied to the eye or taken by the mouth, as eserine, arecoline, etc.

Narcotic.—A medicine which produces sleep and relieves pain, but first cause cerebral excitement, as chloroform, ether, belladonna and alcohol, etc.

Nephritic.—A medicine used in diseases of the kidneys, as buchu, uva ursi, etc.

Nervine.—A medicine that calms nervous excitement or acts favorably in nervous diseases, as potassium bromide, chloral hydrate, etc.

Nutrient.—A medicine which builds up the waste tissues of the system, as cod liver oil, general tonics, etc.

Obtundent.—Any agent which relieves irritation or reduces sensibility, as opium, poultices, etc.

Odontalgic.—Any substance for the relief of toothache, as oil of cloves, morphine, etc.

Odorant.—Any substance with a pronounced odor, as naphthaline, asafoetida, etc.

Opiate.—A drug which causes sleep, as chloral hydrate, opium, etc.

Oxytocic.—Any agent that produces parturition, as cotton root, ergot, etc.