Search Result for "cysteine": 
Wordnet 3.0

NOUN (1)

1. an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine; 



WordNet (r) 3.0 (2006):

cysteine
    n 1: an amino acid containing sulfur that is found in most
         proteins; oxidizes on exposure to air to form cystine