"fissure" in the noun sense
1. crevice, cranny, crack, fissure, chap
a long narrow depression in a surface
2. crack, cleft, crevice, fissure, scissure
a long narrow opening
anatomy) a long narrow slit or groove that divides an organ into lobes
"fissure" in the verb sense
break into fissures or fine cracks
Source: WordNet® (An amazing lexical database of English)
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