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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.

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.


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


(ˈhaɪ drɔɪd)

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hydroid - colonial coelenterates having the polyp phase dominanthydroid - colonial coelenterates having the polyp phase dominant
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Effects of larval starvation and delayed metamorphosis on juvenile survival and growth of the tubed-welling polychaete Hydroides elegans (Haswell).
examined Bucephalus Bivalves 1993 1994 Tellina agius & versicolor 8 10 586 6 Gemma gemma 5 2 141 1 Haminea solitaria 2 0 31 0 Ensis directus 6 5 157 0 Mullinea lateralis 8 4 56 1 Anadara ovalis 0 1 4 0 Tagelus plebeius 0 2 6 0 Nucula proximo 0 1 13 0 Lyonsia hyalina Polychaetes Diopatra cuprea 0 2 16 0 Glycera dibranchiata 0 6 15 0 Hydroides diathus & 0 1 132 0 Filograna implexa Platynereis dumerilii 0 3 15 0 Nemerteans Cerebratulus lacteus 0 7 15 0 Anemones Actinothoe modesta & 0 6 21 0 Edwardsia elegans Barnacles Balanus sp.
Hydroides elegans is a worm that builds its tubular house on the hulls of ships, and relies on bacterial cues to tell it where to settle.
The two serpulid species Hydroides elegans and Neodexiospira pseudocorrugata were found at all stations except Station K in the outer harbor but were often absent during the winter months.
Del Carmen, "The importance of larval choice and hydrodynamics in creating aggregations of Hydroides elegans (Polychaeta: Serpulidae)," Invertebrate Biology, vol.
Por otra parte, se detectaron especie ubicuas y de elevada aparicion en las raices de toda la laguna; tal es el caso de la ostra de mangle Crassostrea rhizophorae (Guilding, 1828), del bryozoario Bugula neritina (Linnaeus, 1758), y de dos especies de poliquetos, Branchiomma nigromaculata e Hydroides sp.
IA), occur only in genera of the Crucigera, Hydroides, Serpula, Ditrupa, Pseudochitinopoma, Ficopomatus, Galeolaria, Pomatoceros, Laminatubus clade (Vinn et al.
Unabia, CRC, Hadfield, MG, "Role of Bacteria in Larval Settlement and Metamorphosis of the Polychaete Hydroides Elegans." Mar.