n.
Any of various marine protozoans of the order Radiolaria, having rigid siliceous skeletons and spicules.
[From New Latin Radiolāria, order name, from Late Latin radiolus, diminutive of Latin radius, ray.]
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
