actinoid

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈæktɪˌnɔɪd/US:USA pronunciation: respellingUSA pronunciation: respelling(aktə noid′)


WordReference Random House Unabridged Dictionary of American English © 2026
ac•ti•noid  (aktə noid′),USA pronunciation adj. 
  1. raylike;
    radiate.
  • actin- + -oid 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
actinoid / ˈæktɪˌnɔɪd/
  1. having a radiate form, as a sea anemone or starfish

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