fissure

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fissure

1. Anatomy a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes
2. a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus
3. a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

fissure

[′fish·ər]
(geology)
A high, narrow cave passageway.
An extensive crack in a rock.
(metallurgy)
A small cracklike discontinuity with a slight opening or displacement of the fracture surfaces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Dorsal view of the brain: A= cerebrum, B= optic lobe, C= cerebellum, D= medulla oblongata, 1= vallecula, 2= wulst, 3= dorsal cerebral longitudinal fissure, 4= olfactory nerve, 5= rostral cerebral pole, 6= caudal cerebral pole, 7= dorsal transverse fissure, 8= pineal body, 9= cerebellar vermis, 10= cerebellar auricle, 11= dorsal medullary fissure.
Lateral view of the brain: A= cerebrum, B= optic lobe, C= cerebellum, D= medulla oblongata, E= spinal cord, 1=wulst, 2= vallecula, 3= olfactory nerve, 4= olfactory lobe, 5= orbital print, 6= lateral part of transverse fissure, 7= optic tract, 8= optic chiasm, 9= optic nerve, 10= infundibulum, 11= hypothysis,12= midbrain, 13= pons, 14= trigeminal nerve, 15= cerebellar fissures, 16= cerebellar lobe.