hy·droid

(hī′droid′)

1. Any of numerous solitary or colonial hydrozoans having a polyp rather than a medusa as the dominant stage of the life cycle.

2. The asexual polyp in the life cycle of a hydrozoan.

[hydr(a) + -oid.]

hy′droid′ adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

hydroid

(ˈhaɪdrɔɪd)

adj

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

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

(Zoology) a hydroid colony or individual

[C19: from hydra + -oid]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

hy•droid

(ˈhaɪ drɔɪd)

adj.

1. of or pertaining to the hydrozoan order Hydroidea, including hydras and marine colonial forms.

2. the phase of hydrozoan development that consists of polyp forms.

[1860–65; hydr(a) + -oid; compare New Latin Hydroidea]

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

hydroid - colonial coelenterates having the polyp phase dominant

hydrozoan

cnidarian, coelenterate - radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms

planula - the flat ciliated free-swimming larva of hydrozoan coelenterates

class Hydrozoa, Hydrozoa - coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes

hydra - small tubular solitary freshwater hydrozoan polyp

siphonophore - a floating or swimming oceanic colony of polyps often transparent or showily colored

sertularian - feathery colony of long-branched stems bearing stalkless paired polyps

Mentioned in

References in periodicals archive

Larval chemical defenses against fishes occurred in each of the three sponges (Callyspongia, Calyx, and Ectyoplasia), one bryozoan (Bugula), and one hydroid (Eudendrium) that we chemically examined [ILLUSTRATION FOR FIGURE 8 OMITTED].

Palatability and chemical defense of marine invertebrate larvae

While heavy scouring, accompanying increased discharge, did not detrimentally affect insect taxa, it did affect hydroid population in two ways.

Effects of abiotic factors on macroinvertebrate drift in the lower Mississippi River, Louisiana

Since the largest hydroid colonies have the best chance of survival, sacrificing individuality can be a smart move.

To eat or not to eat

Phylum Cnidaria Class Hydrozoa Order Anthoathecata Family Hydractiniidae Schuchertinia milleri (Torrey, 1902)--hedgehog hydroid (Fig.

Where the Weird Things are: A Collection of Species Range Extensions in the Southern California Bight

This beautiful morphology, coupled with its rhythmic flexions propelling it through the water (Goodheart et al., 2015), has earned this species the nickname "Spanish shawl." Feeding preferentially on the cnidarian hydroid Eudendrium ramosum (McBeth, 1972), F.

Sparkling Reflective Stacks of Purine Crystals in the Nudibranch Flabellina iodinea

Settlement of scallop, Pecten maximus, spat on natural substrates off south west England: the hydroid connection.

Spatial variation in fish and invertebrate by catches in a scallop trawl fishery

longissima); however, the medusae of this genus are all very similar in morphology, such that connection with their hydroid stage is almost impossible and often unreliable.

Biodiversidad y distribucion especial de las medusas en la region Magallanica (Zona Patagonica Austral)

1990 Zyzzyzus calderi Hydroid Dale Calder, Curator Emeritus, Invertebrate Zoology

What's in a name? Over the last century the ROM has been home to some of this country's most distinguished scientists, researchers, and curators, many of whom have lent their names to newly discovered specimens

While there are scores of different military and civilian unmanned craft, Gibson's training efforts are focused on Hydroid and Bluefin vehicles.

Unmanned vehicle operators require diversity of skills

Norwegian high-tech group Kongsberg Gruppen ASA completes acquisition of US company Hydroid LLC

Conversely Hydroid, an American company specialising in AUVs, was celebrating the decision of the Royal Navy to order two of its Remus 600 vehicles to meet the British force's need for an underwater reconnaissance drone.

A very automated DSEi: the ground and sea exhibition in London illustrated the defence industry's lean towards robotics, automation and autonomy, highlighting increasing efforts to keep soldier, seaman and airman out of harm's way

These zones were characterized by a mussel-dominated assemblage at [approximately] 3 m; a hydroid and bryozoan dominated assemblage at [approximately] 5 m; a sponge, bryozoan, and ascidian dominated assemblage at [approximately] 10 m; and a deeper assemblage of sponges, bryozoans, brachiopods, and ascidians at [approximately] 18 m depth (Witman and Grange 1998).

Species diversity in subtidal landscapes: maintenance by physical processes and larval recruitment