Dated form of shellac.

plural of shell-lac

Any bivalve shell of the genus Mactra.

Any of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped.

A marine gastropod of the family Turbinidae, or the shell thereof.

(physics) The collective states of all electrons in an atom having the same principal quantum number (visualized as an orbit in which the electrons move).

(malacology) Any of the family Arcidae of saltwater clams or marine bivalve molluscs.

(malacology) A marine univalve shell of the genus Bulla and certain shells of similar appearance of the now disused order Tectibranchiata of molluscs.

(business) A legal entity that demonstrably has no liabilities.

(military) A type of ammunition shell which bursts to release a shower of stars for illuminating enemy positions etc.