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[krahy-noid, krin-oid] /ˈkraɪ nɔɪd, ˈkrɪn ɔɪd/
any echinoderm of the class Crinoidea, having a cup-shaped body to which are attached branched, radiating arms, comprising the sea lilies, feather stars, and various fossil forms.
belonging or pertaining to the Crinoidea.
1825-35; < Greek krinoeidḗs, equiv. to krín(on) lily + -oeidēs -oid
Related forms
crinoidal, adjective
noncrinoid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for crinoid
  • Small rugose corals and crinoid ossicles also occur.
  • Small amounts of shell fragments, carbonaceous streaked and crinoid stem fragments.
  • No fossils other than crinoid debris have been found in the lower part of the formation.
  • Today, the only porous sediments are the crinoid and bryozoan sands at the outer edges of the mound.
British Dictionary definitions for crinoid


/ˈkraɪnɔɪd; ˈkrɪn-/
any primitive echinoderm of the class Crinoidea, having delicate feathery arms radiating from a central disc. The group includes the free-swimming feather stars, the sessile sea lilies, and many stemmed fossil forms
of, relating to, or belonging to the Crinoidea
shaped like a lily
Derived Forms
crinoidal, adjective
Word Origin
C19: from Greek krinoeidēs lily-like
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for crinoid

1836, Latinized from Greek krinoeides "lily-like," from krinon "lily" (a foreign word of unknown origin) + -oeides "like" (see -oid).

Online Etymology Dictionary, © 2010 Douglas Harper
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crinoid in Science
Any of various marine echinoderms of the class Crinoidea. Crinoids have a cup-shaped body with five or more feathery arms and sometimes a stalk for attachment to a surface. The arms contain reproductive organs and sensory tube feet. Crinoids were common during the Paleozoic Era and are important index fossils. Sea lilies and feather stars are types of crinoids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for crinoid


any marine invertebrate of the class Crinoidea (phylum Echinodermata) usually possessing a somewhat cup-shaped body and five or more feathery arms. The arms are edged with feathery projections (pinnules) that contain the reproductive organs and carry numerous tube feet with sensory functions. The tentacles also have open grooves, along which cilia (minute, hairlike projections) sweep food particles toward the mouth

Learn more about Crinoidea with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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