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Webster 1913 Edition
Cirrus
‖
Cir′rus
,Noun.
pl.
Cirri
(#)
. [L., lock, curl, ringlet.]
[Also written
cirrhus
.] 1.
(Bot.)
A tendril or clasper.
2.
(Zool.)
(a)
A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri.
(b)
☞ In some of the inferior animals the cirri aid in locomotion; in others they are used in feeding; in the Annelida they are mostly organs of touch. Some cirri are branchial in function.
3.
(Zool.)
The external male organ of trematodes and some other worms, and of certain Mollusca.