Search Result for "allotrope": 
Wordnet 3.0

NOUN (1)

1. a structurally different form of an element;
- Example: "graphite and diamond are allotropes of carbon"



WordNet (r) 3.0 (2006):

allotrope
    n 1: a structurally different form of an element; "graphite and
         diamond are allotropes of carbon"