(US) Initialism of Coding Symbols for a Thesaurus of Adverse Reaction Terms.

Pertaining to a rib. / (biology) Pertaining to a costa. / (entomology) Pertaining to the costa or to the wing areas next to it.

plural of costa

(Britain) A trader who sells fruit and vegetables from a cart or barrow in the street.

(Britain) A large cooking apple. / The tree on which large cooking apples grow. / (archaic, humorous) The human head.

(acting) a person who shares star billing / (acting) a person who slightly lacks the status to be considered a star

to perform with the billing of a costar.

(nautical) A gun that fired a small rocket with a line attached, used to rig a breeches buoy.

plural of costard

Having ribs, or the appearance of ribs. / (botany) Having one or more longitudinal ribs.