A black-backed gull found throughout much of the Southern Hemisphere; Larus dominicanus.

(architecture) To raise (the whole ring of an arch) off its centering, by driving in the keystone forcibly. / (music) To raise the pitch of. / (figuratively) To produce nervous tension in.

(bookbinding) The stitch made in sewing at the head and tail of a book.

Any of numerous clypeastroid sea urchins (sand dollars) of the genera Melitta, Rotula and Encope, with one or more perforations resembling keyholes.

A marine gastropod of the genus Fissurella and allied genera.

A narrow, slender saw, used in cutting keyholes, etc.

A tool used to extract teeth by a motion resembling that of turning a key.

An adjustable wrench in which the movable jaw is made fast by a key.

To retain one's skill through regular practice.

A bolt which has a mortise near the end, and is secured by a cotter or wedge instead of a nut.