A Fissure
- A long, narrow crack or opening made by breaking or splitting, especially in rock or earth.
- (anatomy) A groove, deep furrow, elongated cleft or tear between body parts or in the substance of an organ; a sulcus. Mouth ulcer - Wikipedia
- (anatomy) A break or slit in tissue usually at the junction of skin and mucous membrane.
- A state of incompatibility or disagreement. Synonym: schism