scyphistoma

[ sahy-fis-tuh-muh ]
/ saɪˈfɪs tə mə /
|

noun, plural scy·phis·to·mae, [sahy-fis-tuh-mee] /saɪˈfɪs təˌmi/ scy·phis·to·mas.

a stage in the life cycle of a jellyfish or other scyphozoan when it is fixed in place and reproduces asexually to produce free-swimming medusas.
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British Dictionary definitions for scyphistoma

scyphistoma

/ (saɪˈfɪstəmə) /

noun plural -mae (-ˌmiː) or -mas

a sessile hydra-like individual representing the polyp stage of scyphozoans. It produces forms which become free-swimming jellyfish

Word Origin for scyphistoma

C19: from Greek skuphos cup + stoma
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012