Also found in: Thesaurus, Medical, Wikipedia.
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.
(Zoology) having a radiate form, as a sea anemone or starfish
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Switch to new thesaurus
|Noun||1.||actinoid - any of a series of radioactive elements with atomic numbers 89 through 103|
|Adj.||1.||actinoid - having a radial form; "starfish are actinoid--that is, they are radially symmetrical"|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.