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actinoid

American

[ak-tuh-noid] / ˈæk təˌnɔɪd /

adjective

raylike; radiate.

actinoid British

/ ˈæktɪˌnɔɪd /

adjective

having a radiate form, as a sea anemone or starfish

"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

Etymology

Origin of actinoid

First recorded in 1840–50; actin- + -oid

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023