fissure
- 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
fissure of rolando
- n a brain fissure extending upward on the lateral surface of both hemispheres; separates the frontal and parietal lobes
fissure of sylvius
- n the deepest and most prominent of the cortical fissures; separates the frontal lobes and temporal lobes in both hemispheres
fissurella
- n type genus of the family Fissurellidae: keyhole limpets
fissurella apertura
- n marine limpet having a conical shell with an opening at the apex
fist
- n a hand with the fingers clenched in the palm (as for hitting)