Found 2 items, similar to Actinoid.
English → English (WordNet) Definition: actinoid actinoid adj : having a radial form; “starfish are actinoid--that is, they are radially symmetrical” n : any of a series of radioactive elements with atomic numbers 89 through 103 [syn: actinide, actinon]
English → English (gcide) Definition: Actinoid Actinoid \Ac"tin*oid\, a. [Gr. ?, ?, ray + -oid.] Having the form of rays; radiated, as an actinia. [1913 Webster]