noun, plural cir·rus for 1, cir·ri [sir-ahy] /ˈsɪr aɪ/ for 2, 3.
- a cloud of a class characterized by thin white filaments or narrow bands and a composition of ice crystals: of high altitude, about 20,000–40,000 feet (6000–12,000 meters).
- a cirriform cloud.
- a filament or slender appendage serving as a foot, tentacle, barbel, etc.
- the male copulatory organ of flatworms and various other invertebrates.
Origin of cirrus
Examples from the Web for cirrus
Mandibles with four teeth; caudal appendages twice as long as the pedicels of the sixth cirrus.A Monograph on the Sub-class Cirripedia (Volume 1 of 2)|Charles Darwin
The day was warm for the season—so sultry that the cirrus clouds swimming in the blue ether, looked soft to April tearfulness.Jessamine|Marion Harland
The cirrus may last a few minutes only, or continue for hours.The Rain Cloud|Anonymous
These questions occur, at first sight, respecting every group of cirrus cloud.Modern Painters, Volume V (of 5)|John Ruskin
In the third cirrus, the posterior ramus is sometimes much elongated, but sometimes both rami are short and blunt.A Monograph on the Sub-class Cirripedia (Volume 2 of 2)|Charles Darwin
British Dictionary definitions for cirrus
noun plural -ri (-raɪ)
- a slender tentacle or filament in barnacles and other marine invertebrates
- a hairlike structure in other animals, such as a filament on the appendage of an insect or a barbel of a fish