cirrus

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cir·rus

, pl.

cir·ri

(sir'rŭs, -rī),
A structure formed from a cluster or tuft of fused cilia, constituting one of the sensory or locomotor organs of certain ciliate protozoa.
[L. a curl]

cirrus

(sîr′əs)
n. pl. cirri (sîr′ī′)
Biology
a. A tendril.
b. A slender flexible appendage, such as a tuft of fused cilia of certain protozoans or one of the feathery appendages of a barnacle.