Dictionarycir•rusPronunciation: (sir'us), [key] —n., —pl. cir•rus for 1, cir•riPronunciation: (sir'ī) [key] for 2, 3. 1. Meteorol. a. a cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals: of high altitude, ab. 20,000–40,000 ft. (6000–12,000 m). b. a cirriform cloud. 2. Bot.a tendril. 3. Zool. a. a filament or slender appendage serving as a foot, tentacle, barbel, etc. b. the male copulatory organ of flatworms and various other invertebrates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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