a hole made by a burrowing or gnawing worm, as in timber, nuts, etc.
a theoretical passageway in space between a black hole and a white hole.

1585–95; worm + hole

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wormhole (ˈwɜːmˌhəʊl)
1.  a hole made by a worm in timber, plants, etc
2.  physics a tunnel in the geometry of space--time postulated to connect different parts of the universe

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1593, "hole made by a burrowing insect" (in fruit, etc.), from worm + hole. Astrophysics sense is attested from 1957.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
wormhole   (wûrm'hōl')  Pronunciation Key 
  1. A hole made by a burrowing worm.

  2. A theoretical distortion of space-time that would link points in space through a second set of paths, some of which could be shorter than the shortest path without the wormhole. It is not known whether workholes are possible. See more at space-time.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

wormhole definition

back door

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
In the lobby is a beautiful yellow terrazzo floor along with extremely unusual wormhole marble covering the lobby walls.
It uses wormhole switching with two virtual channels per physical link, source-based routing and adaptive routing.
Gravity would crush the throat of the wormhole, destroying any travelers trying to reach the other side.
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