the alimentary canal, especially between the pylorus and the anus, or some portion of it. Compare foregut, midgut, hindgut.
the bowels or entrails.
Informal. courage and fortitude; nerve; determination; stamina: Climbing that cliff takes a lot of guts.
the inner working parts of a machine or device: The mechanic had the guts of the refrigerator laid out on the kitchen floor.
the belly; stomach; abdomen.
the substance forming the case of the intestine; intestinal tissue or fiber: sheep's gut.
a preparation of the intestines of an animal, used for various purposes, as for violin strings, tennis rackets, or fishing lines.
the silken substance taken from a silkworm killed when about to spin its cocoon, used in making snells for fishhooks.
a narrow passage, as a channel of water or a defile between hills.
Slang. a gut course.
verb (used with object), gutted, gutting.
to take out the guts or entrails of; disembowel.
to destroy the interior of: Fire gutted the building.
to plunder (a house, city, etc.) of contents: Invaders gutted the village.
to remove the vital or essential parts from: The prisoner's letters were gutted by heavy censorship.
basic or essential: to discuss the gut issues.
based on instincts or emotions: a gut reaction; gut decisions.
spill one's guts, Slang. to tell all; lay oneself bare: the famous star spills his guts in his autobiography.

before 1000; Middle English gut, guttes (plural), Old English guttas (plural), akin to gēotan to pour

gutlike, adjective
ungutted, adjective

2b. pluck. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gut (ɡʌt)
1.  a.  the lower part of the alimentary canal; intestine
 b.  the entire alimentary canalRelated: visceral
2.  (often plural) the bowels or entrails, esp of an animal
3.  slang the belly; paunch
4.  See catgut
5.  a silky fibrous substance extracted from silkworms, used in the manufacture of fishing tackle
6.  a narrow channel or passage
7.  informal (plural) courage, willpower, or daring; forcefulness
8.  informal (plural) the essential part: the guts of a problem
9.  informal bust a gut to make an intense effort
10.  informal have someone's guts for garters to be extremely angry with someone
11.  informal hate a person's guts to dislike a person very strongly
12.  informal sweat one's guts out, work one's guts out to work very hard
vb , guts, gutting, gutted
13.  to remove the entrails from (fish, etc)
14.  (esp of fire) to destroy the inside of (a building)
15.  to plunder; despoil: the raiders gutted the city
16.  to take out the central points of (an article), esp in summary form
17.  informal arising from or characterized by what is basic, essential, or natural: a gut problem; a gut reaction
Related: visceral
[Old English gutt; related to gēotan to flow; see fusion]

GUT (ɡʌt)
n acronym for
grand unified theory

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. guttas (pl.) "bowels, entrails," related to geotan "to pour," from PIE *gh(e)u- "pour." Related to M.Du. gote, Ger. Gosse "gutter, drain," M.E. gote "channel, stream." Meaning "easy college course" is student slang from 1916, probably from obsolete slang sense of "feast" (the connecting notion is
"something that one can eat up"). Sense of "inside contents of anything" (usually pl.) is from 1580. Figurative pl. guts "spirit, courage," first recorded 1893; hence gutless "cowardly" (1915). The verb meaning "to remove the guts of" (of fish, etc.) is from c.1300. To hate (someone's) guts is first attested 1918. Gut reaction is 1963, probably a back-formation from gutsy (1936) "tough, plucky."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

gut (gŭt)

  1. The alimentary canal or a portion thereof, especially the intestine or stomach.

  2. The embryonic digestive tube, consisting of the foregut, the midgut, and the hindgut.

  3. guts The bowels; entrails; viscera.

  4. A thin, tough cord made from the intestines of animals, usually sheep, used as suture material in surgery.

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
gut   (gŭt)  Pronunciation Key 
  1. The intestine of a vertebrate animal.

  2. The alimentary canal of an invertebrate animal.

  3. The tube in a vertebrate embryo that later develops into the alimentary canal, lungs, and liver.

Abbreviation of grand unified theory See unified field theory.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Abbreviations & Acronyms
grand unified theory
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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