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Definitiona long narrow crack; or its creation — especially in the ground or in rock
a crack in the unity of a group; or its creation
- his brain had decreased in weight and there was a general smoothing out of cerebral convolutions as well as a deepening and broadening of brain fissures.4 -- June (49% in)
fissures = long narrow creases
There are no more uses of "fissure" in Flowers for Algernon.
Typical Usage (best examples)