Wordnet 3.0
NOUN (1)
1. 
 a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; 
 constitutes 78 percent of the atmosphere by volume; 
 a constituent of all living tissues; 
[syn: nitrogen, N, atomic number 7]
WordNet (r) 3.0 (2006):
atomic number 7
    n 1: a common nonmetallic element that is normally a colorless
         odorless tasteless inert diatomic gas; constitutes 78
         percent of the atmosphere by volume; a constituent of all
         living tissues [syn: nitrogen, N, atomic number 7]