hydroid

adjective
hy·droid | \ˈhī-ˌdrȯid \

Definition of hydroid 

(Entry 1 of 2)

: of or relating to a hydrozoan especially : resembling a typical hydra

hydroid

noun

Definition of hydroid (Entry 2 of 2)

: hydrozoan especially : a hydrozoan polyp as distinguished from a hydrozoan jellyfish

Examples of hydroid in a Sentence

Recent Examples on the Web: Noun

Some grow algae and hydroid gardens on their backs, others can change color at will, and one, the decoy scorpionfish, has a lure on its dorsal fin that resembles a tiny, swimming fish. Troy Farah, Smithsonian, "Why Did a Venomous Fish Evolve a Glowing Eye Spike?," 29 Mar. 2018 The nudibranch, besides using the hydroids for habitat, regularly consume its home colony’s polyps. Sid Perkins, Science | AAAS, "This sea slug has a trick for getting an extra treat," 31 Oct. 2017 In the wild, these slugs are known to feed on hydroids, an invertebrate marine organism. Brigit Katz, Smithsonian, "This Sea Slug Has a Crafty Way of Getting Super-Sized Meals," 4 Nov. 2017 Fourteen of the slugs made a beeline for the hydroid that had been fed, according to a study published recently in Biology Letters. Brigit Katz, Smithsonian, "This Sea Slug Has a Crafty Way of Getting Super-Sized Meals," 4 Nov. 2017 In shallow waters of the Mediterranean and along the Atlantic coast of western Africa, C. peregrina lives on and near corallike colonies of polyps called hydroids. Sid Perkins, Science | AAAS, "This sea slug has a trick for getting an extra treat," 31 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hydroid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hydroid

Adjective

circa 1864, in the meaning defined above

Noun

1865, in the meaning defined above

History and Etymology for hydroid

Adjective

ultimately from New Latin Hydra

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Time Traveler for hydroid

The first known use of hydroid was circa 1864

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More Definitions for hydroid

hydroid

adjective
hy·droid | \ˈhī-ˌdrȯid \

Medical Definition of hydroid 

(Entry 1 of 2)

: of or relating to a hydrozoan especially : resembling a typical hydra

hydroid

noun

Medical Definition of hydroid (Entry 2 of 2)

: hydrozoan especially : a hydrozoan polyp as distinguished from a medusa

More from Merriam-Webster on hydroid

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Britannica.com: Encyclopedia article about hydroid

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