A process shaped liked the lower lobe or ‘lap’ of the human ear; a lobe; esp. in Botany and Conchology. (Cf. auriculate, adj.)

Conchology and Zoology. Originally: the part of a bivalve shell which contains the hinge. In later use also: the posterior region of the foot of…

In scientific and technical uses. Conchology. One of the edges of the aperture of a spiral shell.

Zoology. The aperture of the shell of a gastropod mollusc.

Conchology. = whorl, n. 3.

Conchology. A distinctive raised ridge on the exterior surface of a mollusc shell, usually occurring as one of many such ridges.

The curved elevation within the helix or outer rim of the ear, which surrounds the central cavity or concha.

Zoology. A groove or duct exuding from the aperture of certain gastropods through which the siphon protrudes.

Conchology. The axis of a spiral shell.

That with which a person is clothed or dressed. Conchology. (See quot. 1755) rare.

= body whorl n.

(See quot. 1776.)

Conchology. = columella, n. 2. Now rare.

the inner or parietal lip of a gastropod mollusc shell.

Zoology. A thin plate or wall forming part of a shell or exoskeleton and wholly or partly dividing the enclosed space; a partition between adjacent…

An opening, an open space between portions of solid matter; a gap, cleft, chasm, or hole; the mouth of the shell of a mollusc.

(in the shell of a gastropod mollusc) the last and largest whorl, which (in life) contains the body of the animal; cf. body chamber n.

Any of various plant or animal structures thought to resemble a rib. Cf. rib, n.1 III. Conchology. A rib-like ridge on a shell; = rib, n.1 12d.

A line, groove, furrow or the like formed by the abutting edges of two parts of a thing; an… Natural History (a) Botany (see quot. 1796); (b) Conch…

Conchology. A sharp projection of a shell.

Conchology. The point at which a univalve shell, or each valve of a bivalve shell, is most protuberant.

Conchology. A longitudinal elevation or swelling on the surface of a shell (see quot. 1851).

Zoology. The margin of the aperture of the shell of a mollusc.

The topmost part of something; the apex.

Conchology. The first-formed part of the shell of a gastropod (occasionally of a foraminiferan) which forms the basis for subsequent growth; (also)…

One of the chambers or cells of a series: esp. said of chambered shells.

Conchology. = lunule, n. 3.

Conchology. Either of a pair of prominences on either side of the hinge of certain bivalve shells to which the ends of the external ligament are…

Conchology. = nympha, n. 3.

Conchology. The crescent-shaped depression in front of the umbo. (Cf. lunula, n. 4a.)

= peristome, n. 2a. Obsolete.

(in a shelled cephalopod mollusc) the outermost and largest chamber of the shell, which (in life) is occupied by the body of the animal; cf. body…

Physiology and Zoology. The central core of an organ or organism; the central skeleton or nervous cord; the central stem or core round which…

Conchology. = umbo, n. 3a.

marking of this kind.