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hydrula

noun hy·dru·la \ ˈhīdrələ \
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Definition of hydrula

plural -s
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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Origin and Etymology of hydrula

New Latin, diminutive of hydra (hydrozoan polyp)

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