The Collaborative International Dictionary
Spheromere
Spheromere \Sphe"ro*mere\, n. [Sphere + -mere.] (Zo["o]l.) Any one of the several symmetrical segments arranged around the central axis and composing the body of a radiate anmal.
Wiktionary
spheromere
n. (context zoology English) Any of the symmetrical segments arranged around the central axis and composing the body of a radiate animal.