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English definition of “fissure”

fissure

noun [C]     /ˈfɪʃ.ər/ US  //
a deep, narrow crack in rock or the earthCaves, cracks and crevices specialized medical a long, deep, narrow hollow area in a surface in the body, especially in the cerebral cortex (= the surface of the brain) specialized medical a fault on the surface of a tooth
(Definition of fissure noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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