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scyphistoma

scy·phis·to·ma [ sī fístəmə ] (plural scy·phis·to·mae [ sī fístəm ] or scy·phis·to·mas)


noun 
Definition:
 
stage in jellyfish producing free-swimming offspring: the form taken by a jellyfish or other scyphozoan during the stage in its life cycle when it remains fixed in one place and reproduces asexually to produce free-swimming offspring

[Late 19th century. < Latin scyphus "large cup" < Greek skuphos]
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