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One of a group of univalve shells, having a large aperture or mouth.

Of or pertaining to the chin and lower jaw. -- n.

A median elevation behind the mouth in the arthropods.

An instrument for cutting or scarifying the uterus or the neck of the uterus.

An instrument for making very thin sections for microscopical examination.

The denser part of the protoplasm of a cell.

A muscular segment; one of the zones into which the muscles of the trunk, especially in fishes, are divided; a myocomma.

The funnelshaped opening of a nephridium into the body cavity.

An instrument for cutting or dissecting nerves.

An instrument for measuring the distance of distinct vision, mainly for the selection of eveglasses.

One who is skilled in or practices optometry.

As defined (with minor variations) in the statutes of various States of the United States:

Strong nippers or a chisel for dividing bone.

An instrument for measuring angles for determining elevations, distances, etc.

Universal measurement. [R.] -- Pan`to*met"ric, a. [R.]

The fluid portion of the protoplasm of a cell.

The fringe of teeth around the orifice of the capsule of mosses. It consists of 4, 8, 16, 32, or 64 teeth, and may be either single or double.

An instrument for incising or scarifying the tonsils, etc.

Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving.

An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.