from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A long narrow opening; a crack or cleft.
- n. The process of splitting or separating; division.
- n. A separation into subgroups or factions; a schism.
- n. Anatomy A normal groove or furrow, as in the liver or brain, that divides an organ into lobes or parts.
- n. Medicine A break in the skin, usually where it joins a mucous membrane, producing a cracklike sore or ulcer.
- transitive v. To form a crack or cleft or cause a crack or cleft in.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a crack or opening, as in a rock
- v. To split forming fissures.
from the GNU version of the Collaborative International Dictionary of English
- n. A narrow opening, made by the parting of any substance; a cleft.
- transitive v. To cleave; to divide; to crack or fracture.
from The Century Dictionary and Cyclopedia
- n. A narrow longitudinal opening or groove; a cleft, crack, or chink; a line of separation in any substance produced by parting or cleavage: as, a fissure in the earth or in a rock.
- n. In surgery and anatomy, any solution of continuity in a bone, membrane, or muscle, or a natural division or groove between adjoining parts of like substance; a fissura: a sulcus: as, the longitudinal fissure of the brain, separating the hemispheres.
- n. In entomology: A deep, sharp longitudinal depression of a surface.
- n. A very deep angular notch in a margin, almost dividing the part or organ.
- n. In botany, the opening between segments of a cleft leaf or other organ; a slit formed by the dehiscence of an anther or a capsule.
- n. In heraldry, a bearing resembling the bend sinister, but having one fourth the width of the bend, and capable of being borne on any part of the shield, sometimes in connection with others, sometimes with a bend sinister, a scarpe, or the like. Also called staff.
- n. In pathology, a crack-like sore or ulcer: as, an anal fissure.
- n. See the adjectives.
- To cleave; split; divide; crack or fracture.
- To crack; cleave; split open.
- n. A longitudinal depression on the under surface of the liver.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a long narrow opening
- n. a long narrow depression in a surface
- v. break into fissures or fine cracks
- n. (anatomy) a long narrow slit or groove that divides an organ into lobes
Middle English, cut, from Old French, from Latin fissūra, from fissus, split; see fissi-.(American Heritage® Dictionary of the English Language, Fourth Edition)