Menstruum

(From the same). A fluid body capable of reducing a given solid to the same state, and thus diffusing the latter through every part of the former; called a menstruum, because the chemists first assisted its action by a moderate fire for a philosophical month; synonymous with solvent. See Solutio.

Mentagra

(From mentum, the chin, and Mentagra 4928 a disease,), impetigo. An obstinate tetter, which appeared in Italyduring the reign of Claudius Caesar, beginning upon the chin, extending itself over the face, and descending to the neck, breast, and hands. A cautery was applied to some convenient part, so deep as to penetrate to the bone.

We sometimes find a disease of less virulence which seems to merit this appellation. It affects the bulbs of the hair on the chin, resembling, in its nature and treatment, the tinea capitis.

Mentales

(From mens, the mind). Alienation of the judgment, in which the functions of the mind are disturbed.

Nosologists have formed aclass of diseases under this title, and in an arrangement from symptoms it may probably be admitted. It is, however, necessary to remark, that, though the mind be affected, a laesion of any function, which alone constitutes disease, can only be recognized by the practical physician; and we have found changes, in appearance most purely mental, arise from a material cause. Our idea of the duration of time, for instance, is, as we shall see, produced by opium; a fit of apparent insanity will be relieved by discharging a very moderate quantity of bile. See Mania.

Menthastrum

See Mentha aquatica.

Mentula

(From the Hebrew term matah, a staff). See Penis.

Mentula alata. See Penna.

Mentulagra

(From mentula, and Mentulagra 4929 A disorder of the penis, induced by a contraction of the erectores musculi.

Mentum

(Ab eminendo, from its sticking out) The chin is the anterior protuberance which terminates the lower part of the face; the under part of the chin is termed its basis, distinguished from the throat by a transverse fold, extending from ear to ear; in the middle of the chin a dimple is usually found.

Menyanthes Trifoliata Et Palus-Tris

See Trifolium paludosum.

Mephitis

(From the Syriac term mephuhith, a blast). A poisonous exhalation, or what the miners call a damp. It was formerly applied to any air, not respirable, especially if attended with an offensive smell. Modern chemistry is more accurate; and what was with little discrimination called mephitic is now hydrogen, nitrogen, or carbonic acid gas.

Mergen

(From the Arabic term morgan). See Corallium.

Merlucius

(Quasi maris lucius, the sea pike). See Asellus marinus.

Meryophyllon

See Millefolium.

Merocele

(From Merocele 4937 the thigh, and a rupture). See Hernia femoralis.