One who plays the castanet.

plural of castanetist

The governor or caretaker of a castle or keep.

A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted through a hole in the bolt and bent around the castle nut's projections to lock the nut in place.

plural of castle nut

(idiomatic) A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

A large inflatable structure, resembling a castle etc., on which children jump and play as on a trampoline.

(UK, New Zealand) Alternative form of caster sugar.

(organic chemistry) A pyrrolizidine alkaloid, found in seeds of trees of the genus Castanosperma, that is a glucosidase inhibitor

plural of castor bean