Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of numerous characteristically colonial hydrozoan coelenterates having a polyp rather than a medusoid form as the dominant stage of the life cycle.
  • n. The asexual polyp in the life cycle of a hydrozoan.
  • adj. Of, relating to, or characteristic of a hydroid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of many colonial coelenterates that exist mainly as a polyp; a hydrozoan
  • adj. Of or pertaining to such creatures

from the GNU version of the Collaborative International Dictionary of English

  • adj. Related to, or resembling, the hydra; of or pertaining to the Hydroidea.

from The Century Dictionary and Cyclopedia

  • Like water; living in the water.
  • Resembling the hydra, or an animal of the genus Hydra.
  • Pertaining to the Hydroida or Hydroidea, or having their characters: as, a hydroid hydrozoan.
  • n. One of the Hydroidea.
  • n. A hydropolyp.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. colonial coelenterates having the polyp phase dominant

Etymologies

hydr(a) + -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • This gigantic creature grows from the small one, called a hydroid, represented in the small cut.

    Harper's Young People, November 18, 1879 An Illustrated Weekly

  • They were velella vellella - a hydroid similar to a jellyfish, with the common name of "By-the-wind-sailor".

    December 2008

  • Trematode ‘nurse’ can develop within itself the very unlike ‘Cercaria’, it will not appear impossible that the egg, or ciliated embryo, of a sponge, for once, under special conditions, might become a hydroid polype, or the embryo of a

    Essays

  • The Yekta of the Crimson Sea, are as extraordinary developments of hydroid forms as the giant

    The Moon Pool

  • It was a hydroid, a development of that strange animal-vegetable that, sometimes almost microscopic, waves in the sea depths like a cluster of flowers paralyzing its prey with the mysterious force that dwells in its blossom heads!

    The Moon Pool

  • The smaller the piece, within certain limits, and the younger physiologically, the more nearly does it return to embryonic conditions, a fact which can be studied admirably in the hydroid Corymorpha.

    Popular Science Monthly Oct, Nov, Dec, 1915 — Volume 86

  • Silurian age a very rich fauna has already developed, and representatives are found of all the main Invertebrate groups -- sponges, corals, hydroid colonies, five types of Echinoderms, Bryozoa,

    Form and Function A Contribution to the History of Animal Morphology

  • You see the hydroid does not in the least resemble a jelly-fish.

    Harper's Young People, November 18, 1879 An Illustrated Weekly

  • It was a hydroid, a development of that strange animal-vegetable that, sometimes almost microscopic, waves in the sea depths like a cluster of flowers paralyzing its prey with the mysteri-ous force that dwells in its blossom heads!

    The Moon Pool

  • [1] The Yekta of the Crimson Sea, are as extraordinary developments of hydroid forms as the giant Medusae, of which, of course, they are not too remote cousins.

    The Moon Pool

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