from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
from the GNU version of the Collaborative International Dictionary of English
- n. 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 The Century Dictionary and Cyclopedia
- n. 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.
Sorry, no etymologies found.
Now when the latter arise from the summit of a spine they form in fact a rude tridactyle pedicellaria, and such may be seen on the same spine together with the three lower branches.
Thus every gradation, from an ordinary fixed spine to a fixed pedicellaria, would be of service.