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The Collaborative International Dictionary
Actinomere

Actinomere \Ac*tin"o*mere\, n. [Gr. ?, ?, ray + ? part.] (Zo["o]l.) One of the radial segments composing the body of one of the C[oe]lenterata.

Wiktionary
actinomere

n. (context zoology English) One of the radial segments making up the body of one of the Cœlenterata.