(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).

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.

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

Any species of the brachipod genus Lingula.

(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.

Any of numerous species of small white polished marine shells of the genus Olivella.

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

(zoology) A marine gastropod of the genus Crepidula. The species are numerous. / (zoology) A marine univalve shell of the genus Cymbium, syn. Cymba.