actinoid (n.)

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

    [ Syn: actinide , actinon ]

    actinoid (adj.)

  1. having a radial form; starfish are actinoid--that is, they are radially symmetrical'

The dictionary is based on the WordNet Electronic Lexical Database.
WordNet 3.0 Copyright 2011 by Princeton University. All rights reserved.