Wordnet 3.0
NOUN (1)
1. 
 a base found in DNA (but not in RNA) and derived from pyrimidine; 
 pairs with adenine; 
[syn: thymine, T]
WordNet (r) 3.0 (2006):
thymine
    n 1: a base found in DNA (but not in RNA) and derived from
         pyrimidine; pairs with adenine [syn: thymine, T]