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Adjective: actinoid  'ak-ti,noyd
  1. Having a radial form
    "starfish are actinoid--that is, they are radially symmetrical"
Noun: actinoid  'ak-ti,noyd
  1. Any of a series of radioactive elements with atomic numbers 89 through 103
    - actinide, actinon

Derived forms: actinoids

See also: actinomorphic, actinomorphous

Type of: group, grouping

Encyclopedia: Actinoid