a timepiece, usually free-standing, hanging, or built into a tower, having mechanically or electrically driven pointers that move constantly over a dial showing the numbers of the hours Compare digital clock, watch (sense 7)
any clocklike device for recording or measuring, such as a taximeter or pressure gauge
the downy head of a dandelion that has gone to seed
an electrical circuit that generates pulses at a predetermined rate
(computing) an electronic pulse generator that transmits streams of regular pulses to which various parts of the computer and its operations are synchronized
1371, clokke, orig. "clock with bells," probably from M.Du. klocke, from M.L. (7c.) clocca "bell," from Celt., probably spread by Irish missionaries, ultimately of imitative origin. Replaced O.E. dægmæl, from dæg "day" + mæl "measure, mark." The slang verb sense of "hit, sock" is 1941, originally Australian, probably from earlier slang clock (n.) "face" (1923). O'clock for of the clock is c.1720.