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hydrula

noun
hy·​dru·​la | \ ˈhīdrələ\
plural -s

Definition of hydrula

1 : a hypothetical primitive polyp of simple type
2 : a developmental phase of many coelenterates (as hydroids) in which they have the form of a simple polyp

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History and Etymology for hydrula

New Latin, diminutive of hydra (hydrozoan polyp)

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