Meatus. Canal or passage. External opening of a canal.
Median section. An operation for stone in the bladder in which the perineum and part of the urethra are cut; the prostatic portion of the urethra is dilated to introduce forceps and withdraw the stone.
Medulla Oblongata. Described on [page 90]; illus. [page 96].
Melancholia. A mild form of insanity attended with great gloom and mental depression.
Membranous. Of the nature or construction of membrane.
Meninges. Membranes covering the brain.
Menorrhagia. Immoderate monthly flow.
Menses. Monthly flow of the female. See [page 686].
Menstruation. The bloody evacuation from the womb.
Menstruum. A solvent; as water, alcohol, etc.