Monad. The simplest kind of minute animalcule.

Mucus. A viscid fluid secreted by a mucous membrane.

Multipara. A woman who has had two children or more.

Nævus. A birth mark.

Narcotic. Producing sleep and stupor.

Nares. The passage through the nose; the nostril.

Nates. The seat; the buttocks.

Necrosis. Death of the bone.

Neuralgia. Painful affection of the nerves.

Neurilemma. The sheath investing a nerve.