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radiolarian

[rey-dee-oh-lair-ee-uh n] /ˌreɪ di oʊˈlɛər i ən/
noun
1.
any minute, marine protozoan of the class Radiolaria, or, in some classification schemes, the superclass Actinopoda, having an amebalike body with radiating, filamentous pseudopodia and a usually elaborate outer skeleton.
Origin of radiolarian
1875-1880
1875-80; < New Latin Radiolari(a) name of the group (Latin radiol(us) a small beam, equivalent to radi(us) radius + -olus -ole1 + -aria -aria) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for radiolarian

radiolarian

/ˌreɪdɪəʊˈlɛərɪən/
noun
1.
any of various marine protozoans constituting the order Radiolaria, typically having a siliceous shell and stiff radiating cytoplasmic projections: phylum Actinopoda (actinopods)
Word Origin
C19: from New Latin Radiolaria, from Late Latin radiolus little sunbeam, from Latin radius ray, radius
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for radiolarian
n.

1862, from Radiolaria, Modern Latin classification name, from Latin radiolus, diminutive of radius (q.v.).

Online Etymology Dictionary, © 2010 Douglas Harper
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radiolarian in Science
radiolarian
  (rā'dē-ō-lâr'ē-ən)   
Any of various marine protozoans of the group Radiolaria, having rigid skeletons usually made of silica. The skeletons are usually spherically symmetrical and structurally complex, containing elaborate patterns of perforations (through which pseudopods extend) and often spicules. Skeletal remains of radiolarians sink to form ooze on the ocean floor, and prehistoric radiolarian ooze has fossilized to become chert and flint.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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