fissure

[fish-er]
noun
1.
a narrow opening produced by cleavage or separation of parts.
2.
cleavage ( def 1 ).
3.
Anatomy. a natural division or groove in an organ, as in the brain.
verb (used with object), fissured, fissuring.
4.
to make fissures in; cleave; split.
verb (used without object), fissured, fissuring.
5.
to open in fissures; become split.

Origin:
1375–1425; late Middle English < Latin fissūra cleaving, cleft, fissure, equivalent to fiss(us) divided (see fissi-) + -ūra -ure

fissural, adjective
fissureless, adjective
subfissure, noun
superfissure, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fissure (ˈfɪʃə)
 
n
1.  any long narrow cleft or crack, esp in a rock
2.  a weakness or flaw indicating impending disruption or discord: fissures in a decaying empire
3.  anatomy See also sulcus a narrow split or groove that divides an organ such as the brain, lung, or liver into lobes
4.  a small unnatural crack in the skin or mucous membrane, as between the toes or at the anus
5.  a minute crack in the surface of a tooth, caused by imperfect joining of enamel during development
 
vb
6.  to crack or split apart
 
[C14: from medical Latin fissūra, from Latin fissus split]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

fissure
c.1400, from O.Fr. fissure, from L. fissura "a cleft," from root of findere "to split, cleave," from PIE *bhi-n-d-, from base *bheid- "to split" (cf. Skt. bhinadmi "I cleave," O.H.G. bizzan "to bite," O.E. bita "a piece bitten off, morsel," O.N. beita "to hunt with dogs," beita "pasture, food").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fissure fis·sure (fĭsh'ər)
n.

  1. A deep furrow, cleft, or slit.

  2. A developmental break or fault in the enamel of a tooth.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fissure   (fĭsh'ər)  Pronunciation Key 
A long, narrow crack or opening in the face of a rock. Fissures are often filled with minerals of a different type from those in the surrounding rock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The lack of members, or shareholders, is the corporate legal fissure.
Secondly the slope of the ground underneath the icecap is inwards, into the
  caldera, where the active fissure is at it.
Check out the nearby blowhole, a small opening above a fissure from which cool
  air is released.
To apply crack filler, pull any weeds from the fissure and brush out all debris
  with a whisk broom.
Images for fissure
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