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1 (pl. cirri) In certain ciliate Protozoa, an organelle, formed by the fusion of a group of cilia, which usually functions in locomotion.

2 In many invertebrates, a slender bodily appendage, often resembling a tentacle. In Polychaeta it bears cilia.

3 In some flatworms and trematodes, an eversible copulatory organ.

4 In some fishes (e.g. Creediidae) a tuft of skin on the jaw.

5 See Cirripedia.

Subjects: Biological Sciences — Meteorology and Climatology.

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