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Crossword clue: a cyst or sac of a siphonophore, containing air, and serving as a float, as in physalia.

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Possible answers

pneumatocyst 12 letters web-def

A cyst or sac of a siphonophore, containing air, and serving as a float, as in Physalia.

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any siphonophore which has an air sac for a float, as the physalia. 50% similar → physograde

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