Definition of fissure noun from the Oxford Advanced American Dictionary

 

fissure

 noun
noun
NAmE//ˈfɪʃər//
 
(technology)
 
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a long, deep crack in something, especially in rock or in the earth parched grassland dissected by open dry fissures
NAmE//ˈfɪʃərd//
 
adjective fissured rock/terrain
See the Oxford Advanced Learner's Dictionary entry: fissure