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Answer for the clue "Marine colonial hydrozoans ", 12 letters:
siphonophora

Word definitions for siphonophora in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Siphonophora \Si`pho*noph"o*ra\, prop. n. pl. [NL., fr. Gr. ??? a siphon + fe`rein to bear.] (Zo["o]l.) An order of pelagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which ...