Search Result for "adaptive radiation":
Wordnet 3.0

NOUN (1)

1. the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches; 



The Collaborative International Dictionary of English v.0.48:

adaptive radiation \adaptive radiation\ n.
   1. (Palaeontology) the evolutionary generation of multiple
      specialized life forms from one ancestral form, evidenced
      in the fossil record. The inverse of extinction.
      [PJC]


WordNet (r) 3.0 (2006):

adaptive radiation
    n 1: the development of many different forms from an originally
         homogeneous group of organisms as they fill different
         ecological niches