Actinoid

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Actinoid \Ac"tin*oid\, a. [Gr. ?, ?, ray + -oid.]
     Having the form of rays; radiated, as an actinia.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  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}]