Webster's English Dictionary

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cirrus

cir.rus \'sir-*s\ \'sir-.i-\ n or cir.ri [NL, fr. L, curl] pl  1: TENDRIL  
   2: a slender usu. flexible animal appendage : as  2a: an arm of a barnacle  
   2b: a filament of a crinoid  2c: a tactile barbel (as of a fish)  2d: a 
   tuft of hair on the legs or antennae of many insects  2e: a fused group of 
   cilia functioning like a limb on some protozoans  2f: the male copulatory 
   organ of various invertebrate animals  3: a wispy white cloud usu. of 
   minute ice crystals formed at altitudes of 2 0, 000 to 40, 000 feet