hydroid

American  

[hahy-droid] / ˈhaɪ drɔɪd /

adjective

1. noting or pertaining to that form of hydrozoan that is asexual and grows into branching colonies by budding.

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noun

1. the phase of a hydrozoan coelenterate that consists of polyp forms usually growing as an attached colony.

hydroid British  

/ ˈhaɪdrɔɪd /

adjective

1. of or relating to the Hydroida, an order of colonial hydrozoan coelenterates that have the polyp phase dominant

2. (of coelenterate colonies or individuals) having or consisting of hydra-like polyps

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noun

1. a hydroid colony or individual

hydroid Scientific  

/ hī′droid′ /

1. Any of numerous, usually colonial marine cnidarians, having a polyp rather than a medusoid form as the dominant stage of the life cycle. Hydroids have a simple cylindrical body with a mouthlike opening surrounded by tentacles. Most species form colonies with individual hydroids branching off from a common hollow tube that is probably used to share ingested food. The young develop from eggs or from buds. The most well-known hydroids are the hydras (genus Hydra), which are atypical in being both freshwater and solitary.

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Etymology

Origin of hydroid

First recorded in 1860–65; hydr(a) + -oid

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Example Sentences

See Examples For:

hydroid

An example is the colonial hydroid called an Obelia. The sessile polyp form has, in fact, two types of polyps, shown in Figure 3.

From Textbooks ● Jan. 1, 2015

But because there are so few hydroid experts, our understanding of these species is staggeringly incomplete.

From New York Times ● Nov. 28, 2012

“Finding really good hydroid experts is very difficult,” says James Carlton, a professor of marine sciences at Williams College and the director of the Williams-Mystic Maritime Studies Program.

From New York Times ● Nov. 28, 2012

Peterson is closely following the work of Daniel Martínez, a biologist at Pomona College and one of the world’s leading hydroid scholars.

From New York Times ● Nov. 28, 2012

Long ago, Trembley attempted to cause, by grafting, the union of two pieces of hydroid polyps into a single individual.

From The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development by Oscar Hertwig

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