noun hy·dru·la \ˈhīdrələ\

Definition of hydrula



  1. 1 :  a hypothetical primitive polyp of simple type

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

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of hydrula

New Latin, diminutive of hydra (hydrozoan polyp)

Seen and Heard

What made you want to look up hydrula? Please tell us where you read or heard it (including the quote, if possible).


a brief usually trivial fact

Get Word of the Day daily email!