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ac·ti·noid
(ăk′tə-noid′)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.
actinoid
(ˈæktɪˌnɔɪd)adj
(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
ThesaurusAntonymsRelated WordsSynonymsLegend:
| Noun | 1. |  actinoid - any of a series of radioactive elements with atomic numbers 89 through 103group, grouping - any number of entities (members) considered as a unit |
| Adj. | 1. |  actinoid - having a radial form; "starfish are actinoid--that is, they are radially symmetrical"actinomorphic, actinomorphous - capable of division into symmetrical halves by any longitudinal plane passing through the axis |
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