noun Etymology: ultimately from Greek hydr- + zōion animal — more at zo- Date: 1877 any of a class (Hydrozoa) of coelenterates that includes solitary and colonial polyps and jellyfishes having no stomodeum or gastric tentacles • hydrozoan adjective

New Collegiate Dictionary. 2001.

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  • hydrozoan — [hī΄drə zō′ən] adj. [< ModL Hydrozoa < HYDRA + ZO + AN] of a class (Hydrozoa) of cnidarians having a saclike body consisting of two layers of cells, and a mouth that opens directly into the body cavity n. any animal of this class, as a… …   English World dictionary

  • hydrozoan — hy·dro·zo·an zō ən n any of the class Hydrozoa of coelenterates hydrozoan adj * * * hy·dro·zo·an (hi″dro zoґən) an individual of the class Hydrozoa …   Medical dictionary

  • hydrozoan — /huy dreuh zoh euhn/, n. 1. any freshwater or marine coelenterate of the class Hydrozoa, including free swimming or attached types, as the hydra, in which one developmental stage, either the polyp or medusa, is absent, and colonial types, as the… …   Universalium

  • hydrozoan — noun Any of many colonial coelenterates, of the class Hydrozoa, including the hydras, hydroids, hydrocorals, and siphonophores …   Wiktionary

  • hydrozoan — adj. belonging to the class Hydrozoa (Zoology) n. member of the class Hydrozoa (Zoology) …   English contemporary dictionary

  • hydrozoan — hy•dro•zo•an [[t]ˌhaɪ drəˈzoʊ ən[/t]] n. 1) ivt any freshwater or marine cnidarian of the classHydrozoa, including attached and free swimming, often colonial, forms in which the medusa stage is reduced or lacking 2) ivt belonging or pertaining to …   From formal English to slang

  • hydrozoan — /haɪdrəˈzoʊən/ (say huydruh zohuhn) adjective 1. relating to the Hydrozoa, a class of coelenterates that comprises solitary or colonial polyps and free swimming medusas. –noun 2. a member of the Hydrozoa. {New Latin Hydrozōön, from hydro ,… …   Australian English dictionary

  • hydrozoan —   n. polyp.    ♦ hydrozoal,    ♦ hydrozoic, a …   Dictionary of difficult words

  • hydrozoan — n. & adj. n. any aquatic coelenterate of the class Hydrozoa of mainly marine polyp or medusoid forms, including hydra and Portuguese man of war. Etymology: mod.L Hydrozoa (as HYDRA, Gk zoion animal) * * * noun colonial coelenterates having the… …   Useful english dictionary

  • hydrozoan Zoology — [ˌhʌɪdrə(ʊ) zəʊən] noun a marine invertebrate (coelenterate) of the class Hydrozoa, which includes hydras and Portuguese men of war. adjective relating to hydrozoans. Origin from mod. L. Hydrozoa, from hydro + Gk zōion animal …   English new terms dictionary

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