- fissure⇄fissure, noun, verb, -sured,-suring.
- fissure⇄noun 1. a long, narrow opening; split or crack.
Ex. Water dripped from a fissure in a rock.
2. a splitting apart; division into parts.
3. a natural cleft or opening in an organ or part, as those separating the convolutions of the brai - fissure⇄v.i. to become split or cleft.
- fissure⇄v.t. to split apart; divide into parts.