Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Anatomy A split or opening in an organ or part.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A longitudinal opening made by cutting; a cleft; a fissure.

from the GNU version of the Collaborative International Dictionary of English

  • n. A longitudinal opening in a body, made by cutting; a cleft; a fissure.

from The Century Dictionary and Cyclopedia

  • n. A longitudinal opening in a body made by cutting; a cleft; a rent; a fissure; hence, a rupture, split, or division; a schism.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a long narrow opening

Etymologies

Middle English, from Old French, from Latin scissūra, from scissus, past participle of scindere, to split; see scission.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Late Latin *scissura (“fissure”) (compare Italian scissura), from Latin scissurus ("about to split"), from scindo ("I split"). (Wiktionary)

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