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A genus of cephalopods having a multilocular, internal, siphunculated shell in the form of a flat spiral, the coils of which are not in contact.

Proof against the splinters, or fragments, of bursting shells.

A kind of drawing knife or planing tool for dressing the spokes of wheels, the shells of blocks, and other curved work.

(Med.), the separation of a tendon from its point of insertion, with the detachment of a shell of bone to which the tendon is attached.

To make a complete staircase is a curious piece of architecture. Sir H. Wotton. Staircase shell. (Zoöl.) (a) Any scalaria, or wentletrap. (b) Any species of Solarium, or perspective shell.

Sting ray. (Zoöl.) See under 6th Ray. -- Sting winkle (Zoöl.), a spinose marine univalve shell of the genus Murex, as the European species (Murex erinaceus). See Illust. of Murex.

Material, such as oyster shells, spread on the sea bottom for oyster spat to adhere to. [Local, U.S.] Stool of a window, or Window stool (Arch.), the flat piece upon which the window shuts down, and which corresponds to the sill of a door; in the United States, the narrow shelf fitted on the inside against the actual s…

groovings, produced on a rock by a glacier passing over it; the striæ on the surface of a shell; a stria of nervous matter in the brain.

A stria; as, the striations on a shell.

n a thread, or as if so arranged; a succession; a concatenation; a chain; as, a string of shells or beads; a string of dried apples; a string of houses; a string of arguments. "A string of islands." Gibbon.

A fossil shell of the genus Strombus.

A genus of marine gastropods in which the shell has the outer lip dilated into a broad wing. It includes many large and handsome species commonly called conch shells, or conchs. See Conch.

Beneath or forward of the umbos of a bivalve shell.

The most elevated part of a bivalve shell, or the part in which the hinge is situated. Summit level, the highest level of a canal, a railroad, or the like, in surmounting an ascent.

to show the time of day by means of the shadow of a gnomon, or style, on a plate. Sundial shell (Zoöl.), any shell of the genus Solarium. See Solarium.

Hence, the region where the sun sets; the west. Sunset shell (Zoöl.), a West Indian marine bivalve (Tellina radiata) having a smooth shell marked with radiating bands of varied colors resembling those seen at sunset or before sunrise; -- called also rising sun.

ressed line, as between the segments of a crustacean, or between the whorls of a univalve shell. Glover's suture, Harmonic suture, etc. See under Glover, Harmonic, etc.

A cod, or pod, as of beans or pease. [Prov. Eng.] Swad, in the north, is a peascod shell -- thence used for an empty, shallow-headed fellow. Blount.

A boat shell (Crepidula fornicata) of the American coast. [Local, U.S.]

Not teachable. [R.] Shelley.