We found 20 dictionaries that define the word hydrozoan:

General (16 matching dictionaries)

1. hydrozoan: Merriam-Webster
2. hydrozoan: Oxford Learner's Dictionaries
3. hydrozoan: American Heritage Dictionary of the English Language
4. hydrozoan: Collins English Dictionary
5. hydrozoan: Vocabulary.com
6. hydrozoan: Wordnik
7. hydrozoan: Wiktionary
8. hydrozoan: Webster's New World College Dictionary, 4th Ed.
9. hydrozoan: The Wordsmyth English Dictionary-Thesaurus
10. hydrozoan: Infoplease Dictionary
11. hydrozoan: Dictionary.com
12. Hydrozoan: Wikipedia, the Free Encyclopedia
13. hydrozoan: Rhymezone
14. hydrozoan: FreeDictionary.org
15. hydrozoan: Mnemonic Dictionary
16. hydrozoan: TheFreeDictionary.com

Computing (1 matching dictionary)

17. hydrozoan: Encyclopedia

Medicine (2 matching dictionaries)

18. hydrozoan: Merriam-Webster Medical Dictionary
19. hydrozoan: Medical dictionary

Science (1 matching dictionary)

20. Fishkeeping glossary (No longer online)

(Note: See hydrozoans as well.)

Definitions from Wiktionary (hydrozoan) ▸ noun:  Any of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores. Similar: hydroid, hydrosome, hydrozoa, hydrosoma, hydrophyton, siphonophore, hydranth, hydrotheca, hydrophyllium, hydrœcium, more... Types: Portuguese mo' war, by-the-wind sailor, blue bottle, mauve stinger, pink meanie, more... ▸ Words similar to hydrozoan ▸ Usage examples for hydrozoan ▸ Idioms related to hydrozoan ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hydrozoan ▸ Words that often appear near hydrozoan ▸ Rhymes of hydrozoan ▸ Invented words related to hydrozoan