pedicellaria

from The Century Dictionary.

• noun In echinoderms, a small two-pronged pincer-like body upon the exterior, as of a starfish, attached to the spines and to the body-wall. See cut under Echinoidea.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A peculiar forcepslike organ which occurs in large numbers upon starfishes and echini. Those of starfishes have two movable jaws, or blades, and are usually nearly, or quite, sessile; those of echini usually have three jaws and a pedicel. See Illustration in Appendix.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology A small, stalk-shaped structure of the sea urchin and other echinoderms, which has three pincer-like structures at the end that perform cleaning functions and serve as defense against predators.