fissure
fi sher
- n a long narrow depression in a surface
- n a long narrow opening
- n (anatomy) a long narrow slit or groove that divides an organ into lobes
- v break into fissures or fine cracks
- On July 13, 1831, fountains of lava gushed along a fissure, exploding on contact with the water and spitting out billowing clouds of black ash.
- In January 1973, an eruption began along a 2km-long fissure not far from the center of the town of Vestmannaeyjar.
- After an exchange of passwords, a new guard was assigned to lead us straight up the rocks beside a waterfall deep into a fissure in the towering limestone crag.