Synonyms
Antonyms

1. actinoid

adjective. having a radial form.

Synonyms

  • actinomorphic

Antonyms

  • inactivity
  • zygomorphous

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2. actinoid

noun. any of a series of radioactive elements with atomic numbers 89 through 103.

Synonyms

  • grouping
  • actinide
  • actinon
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