cirripedia

‖n. pl. [ NL., fr. L. cirrus curl + pes, pedis, foot. ] (Zool.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa. [ 1913 Webster ]