(figuratively) A stunning shock. / (uncountable) A psychiatric condition characterized by fatigue caused by battle. / A person with the condition.

The pearl oyster.

(chiefly UK) A lightweight tracksuit consisting of a zip-front jacket and matching elasticated trousers, each having an outer nylon shell, often bearing panels and flashes of different colours, and inner cotton lining; popular in the late 1980s and early 1990s both as sportswear and as general leisurewear.

(informal, transitive, intransitive) To pay money, to disburse; especially, to pay a great deal of money.

(obsolete) A game played on a billiard table, a variation of pool.

(chemistry) the outermost shell of electrons in an atom; these electrons take part in bonding with other atoms

(computing) A prewritten list of commands, and perhaps other control information, to be executed (interpreted) by a shell or other command interpreter.

Synonym of razor clam

Any of various molluscs, of the class Scaphopoda, that have curved, tapering shells and a spade-like foot

A game of skill which requires the bettor to guess which of three small cups (or shells) a pea-sized object is concealed under, after the party operating the game rapidly rearranges them, providing opportunity for sleight-of-hand trickery.