DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   fissure
       n 1: a long narrow depression in a surface [syn: crevice,
            cranny, crack, fissure, chap]
       2: a long narrow opening [syn: crack, cleft, crevice,
          fissure, scissure]
       3: (anatomy) a long narrow slit or groove that divides an organ
          into lobes
       v 1: break into fissures or fine cracks