Used other than figuratively or idiomatically: see cylinder, head.

Shaped like a cylinder. / (cartography) Describing a map projection in which meridians are mapped onto vertical lines and parallels of latitude onto horizontal lines.

(broad sense) A weather phenomenon consisting of a system of winds rotating around a center of low atmospheric pressure

To separate using a cyclone separator. / To storm as a cyclone. / To whirl in spirals as a result of a cyclone or whirlwind-like force. / To storm wildly; to be in a frenzy.

The young of a swan.

(geometry) A quadrilateral whose vertices all intersect a single circle.

(music) A concave plate of brass or bronze that produces a sharp, ringing sound when struck: played either in pairs, by striking them together, or singly by striking with a drumstick or the like.

(Greek mythology, Roman mythology) A one-eyed giant from Greek and Roman mythology. / A one-eyed creature of any species. / (derogatory) A person with only one working eye.

(music) That which unfolds a single recurrent interval in a series that closes with a return to the initial pitch class.

(usually capitalized) Ursa Minor or Polaris, the North Star, used as a guide by navigators. / (figuratively) That which serves to guide or direct; a guiding star.