cirrus: Meaning and Definition of

cir•rus

1. 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).
2. a cirriform cloud.
2. a tendril.
1. a filament or slender appendage serving as a foot, tentacle, barbel, etc.
2. the male copulatory organ of flatworms and various other invertebrates.