Dictionary.net

• 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

2006 - WordNet 3.0
By Princeton University

• 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

2011 - English Dictionary Database
By DataStellar Co., Ltd