a reinforced-concrete joist with sloping sides and the top wider than the bottom.
[kop] /kɒp/ noun 1. Usually, Keystone Kops. (in early silent movies) a team of comic policemen noted for their slapstick routines. 2. Also, Keystone Cop. a person noted for bungling inefficiency: a backfield of Keystone Kops.
[kee-stoh-ner] /ˈkiˌstoʊ nər/ noun, Informal. 1. a native or inhabitant of Pennsylvania (used as a nickname).
noun 1. Pennsylvania (used as a nickname).
[kee-strohk] /ˈkiˌstroʊk/ noun 1. one of any on a machine operated by a keyboard, as a typewriter, computer terminal, or Linotype: I can do 3000 keystrokes an hour. /ˈkiːˌstrəʊk/ noun 1. a single operation of the mechanism of a typewriter or keyboard-operated typesetting machine by the action of a key n. 1902, from key (n.1) […]