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se of the genus Strombus, which are of large size. S. gigas is the large pink West Indian conch. The large king, queen, and cameo conchs are of the genus Cassis. See Cameo.

The plain semidome of an apse; sometimes used for the entire apse.

Pertaining to the concha, or external ear; as, the conchal cartilage.

One of the Conchifera.

That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.

Producing or having shells.

Shaped like one half of a bivalve shell; shell-shaped.

See Quinidine.

A fossil or petrified conch or shell.

Composed of shells; containing many shells.

A kind of spiral curve found in certain univalve shells. Agassiz.

A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.

Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

Pertaining to, or connected with, conchology.

One who studies, or is versed in, conchology.

The science of Mollusca, and of the shells which they form; malacology.

An instrument for measuring shells, or the angle of their spire.

The art of measuring shells or their curves; conchyliometry.

Of or pertaining to shells; resembling a shell; as, conchyliaceous impressions. Kirwan.

See Conchologist, and Conchology.