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Fissure

/ˈfiSHər/

Noun

1. A groove, natural division, deep furrow, elongated cleft, or tear in various parts of the body. (wikipedia.org)

2. Any cleft or groove, normal or otherwise, especially a deep fold in the cerebral cortex which involves the entire thickness of the brain wall. (wiktionary.org)

3. A long narrow slit or groove that divides an organ into lobes. (wordnetweb.princeton.edu)

Verb

1. Split or crack (something) to form a long narrow opening. (Google Dictionary)

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