The Collaborative International Dictionary
Hydrozoon
Hydrozoon \Hy`dro*zo"["o]n\, n.; pl. L. Hydrozoa, E. Hydrozo["o]ns. [NL.] (Zo["o]l.) One of the Hydrozoa.
Wiktionary
hydrozoon
n. (context zoology English) One of the Hydrozoa.