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
Historical Examples of cirrus
We will not say whether the old masters painted this cirrus or not.
There must be text-books on how to tell the cumuli from the cirrus.Post-Impressions
The third cirrus is about one third longer than the second cirrus.
In the sixth cirrus there are on each segment four pairs of spines.
The rami of the first cirrus are a little unequal in length.
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
Word Origin for cirrus
1708, "curl-like fringe or tuft," from Latin cirrus "a lock of hair, tendril, curl, ringlet of hair; the fringe of a garment." In meteorology, cirrus clouds attested from 1803. So called from fancied resemblance of shape.