Cirrus

Part of speech: noun (n.)

1. A tendril or clasper.

2. 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.

3. The jointed, leglike organs of Cirripedia. See Annelida, and Polychæta.

4. The external male organ of trematodes and some other worms, and of certain Mollusca.

5. See under Cloud.