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actinoid

Adjective

ac=ti=noid

WORDNET DICTIONARY

actinoid(n = noun.substance) actinide, actinon - any of a series of radioactive elements with atomic numbers 89 through 103; Array

is a kind of group, grouping

actinoid(s = adj.all) Array - having a radial form; "starfish are actinoid--that is, they are radially symmetrical"

actinoid, a. [Gr. , , ray + -oid.].

Having the form of rays; radiated, as an actinia. [1913 Webster]

actinoid, var. of ACTINIDE.

For further exploring for "actinoid" in Webster Dictionary Online