Wordnet 3.0
NOUN (1)
1. 
 battle in World War I (1915); 
 Germans wanted to try chlorine (a toxic yellow gas) as a weapon and succeeded in taking considerable territory from the Allied salient; 
[syn: Ypres, battle of Ypres, second battle of Ypres]
WordNet (r) 3.0 (2006):
second battle of Ypres
    n 1: battle in World War I (1915); Germans wanted to try
         chlorine (a toxic yellow gas) as a weapon and succeeded in
         taking considerable territory from the Allied salient [syn:
         Ypres, battle of Ypres, second battle of Ypres]