Definition of fissure noun from the Oxford Advanced Learner's Dictionary

 

fissure

 noun
noun
BrE BrE//ˈfɪʃə(r)//
 
; NAmE NAmE//ˈfɪʃər//
 
(specialist)
 
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a long deep crack in something, especially in rock or in the earth parched grassland dissected by open dry fissures fissures in the ocean floor Word Origin late Middle English: from Old French, or from Latin fissura, from findere ‘to split’.
See the Oxford Advanced American Dictionary entry: fissure