cat Look up cat at Dictionary.com
O.E. (c.700), from W.Gmc. (c.400-450), from P.Gmc. *kattuz, from L.L. cattus. The near-universal European word now, it appeared in Europe as L. catta (Martial, c.75 C.E.), Byzantine Gk. katta (c.350) and was in general use on the continent by c. 700, replacing L. feles. Probably ult. Afro-Asiatic (cf. Nubian kadis, Berber kadiska, both meaning "cat"). Ar. qitt "tomcat" may be from the same source. Cats were domestic in Egypt from c.2000 B.C.E., but not a familiar household animal to classical Greeks and Romans. The nine lives have been proverbial since at least c.1562. Extended to lions, tigers, etc. 1607. As a term of contempt for a woman, from c.1225. Slang sense of "prostitute" is from at least 1401. Slang sense of "fellow, guy," is from 1920, originally in U.S. Black Eng.; narrower sense of "jazz enthusiast" is recorded from 1931. Catcall first recorded 1659; catnap is from 1823; catfish is from 1620; catwalk is from 1917. Cat's-cradle is from 1768. Cat-o'-nine-tails (1695), probably so called in reference to its "claws," was legal instrument of punishment in British Navy until 1881. Cat's paw (1769, but cat's foot in the same sense, 1597) refers to old folk tale in which the monkey tricks the cat into pawing chestnuts from a fire; the monkey gets the nuts, the cat gets a burnt paw. To rain cats and dogs (c.1652) is probably an extension of cats and dogs as proverbial for "strife, enmity" (1579). Cat-witted "small-minded, obstinate, and spiteful" (1673) deserved to survive. For Cat's meow, cat's pajamas, see bee's knees.
CAT Look up CAT at Dictionary.com
1975, medical acronym for computerized axial tomography.