ActinotrochaAc`ti*not"ro*cha\, n. pl. [NL.; Gr. ?, ?, a ray + ? a ring.] (Zo["o]l.) A peculiar larval form of Phoronis, a genus of marine worms, having a circle of ciliated tentacles.
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
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