Source : WordNet®

Ypres
     n 1: battle in World War I (1917); an Allied offensive which
          eventually failed because tanks bogged down in the
          waterlogged soil of Flanders; Germans introduced mustard
          gas which interfered with the Allied artillery [syn: {battle
          of Ypres}, {third battle of Ypres}]
     2: 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: {battle
        of Ypres}, {second battle of Ypres}]
     3: battle in World War I (1914); heavy but indecisive fighting
        as the Allies and the Germans both tried to break through
        the lines of the others [syn: {battle of Ypres}, {first
        battle of Ypres}]