Webster's English Dictionary

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fissure

1. fis.sure \'fish-*r\ n 1: a narrow opening or crack of some length and 
   depth usu. occurring from s ome breaking or parting 2: a separation or 
   disagreement in thought or viewpoint : SCHISM  3a: a natural cleft between 
   body parts or in the substance of an organ  3b: a break or lesion in tissue 
   usu. at the junction of skin and mucous mem brane
2. fissure vt : to break into fissures : CLEAVE, CRACK, DIVIDE