Synonyms for actinoid

Noun

1. actinoid, actinide, actinon, group, grouping

usage: any of a series of radioactive elements with atomic numbers 89 through 103

Adjective

1. actinoid, actinomorphic (vs. zygomorphic), actinomorphous

usage: having a radial form; "starfish are actinoid--that is, they are radially symmetrical"