(1):

(n.) The external male organ of trematodes and some other worms, and of certain Mollusca.

(2):

(n.) A tendril or clasper.

(3):

(n.) 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.

(4):

(n.) The jointed, leglike organs of Cirripedia. See Annelida, and Polychaeta.

(5):

(n.) See under Cloud.