[bahy-past, -pahst]

1375–1425; late Middle English (adj.); see by1 (adv.), past Unabridged


[bahy-pas, -pahs]
a road enabling motorists to avoid a city or other heavy traffic points or to drive around an obstruction.
a secondary pipe or other channel connected with a main passage, as for conducting a liquid or gas around a fixture, pipe, or appliance.
Electricity, shunt ( def 9 ).
a surgical procedure in which a diseased or obstructed hollow organ is temporarily or permanently circumvented. Compare coronary bypass, gastric bypass, heart-lung machine, intestinal bypass.
verb (used with object), bypassed or (Rare) bypast; bypassed or bypast; bypassing.
to avoid (an obstruction, city, etc.) by following a bypass.
to cause (fluid or gas) to follow a secondary pipe or bypass.
to neglect to consult or to ignore the opinion or decision of: He bypassed the foreman and took his grievance straight to the owner.
Also, by-pass.

1840–50; apparently back formation from by-passage; see by1 (adj.), passage1

bypasser, by-passer, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bypass (ˈbaɪˌpɑːs)
1.  a main road built to avoid a city or other congested area
2.  any system of pipes or conduits for redirecting the flow of a liquid
3.  a means of redirecting the flow of a substance around an appliance through which it would otherwise pass
4.  surgery
 a.  See coronary bypass the redirection of blood flow, either to avoid a diseased blood vessel or in order to perform heart surgery
 b.  (as modifier): bypass surgery
5.  electronics
 a.  an electrical circuit, esp one containing a capacitor, connected in parallel around one or more components, providing an alternative path for certain frequencies
 b.  (as modifier): a bypass capacitor
vb , -passes, -passing, -passed, -past
6.  to go around or avoid (a city, obstruction, problem, etc)
7.  to cause (traffic, fluid, etc) to go through a bypass
8.  to proceed without reference to (regulations, a superior, etc); get round; avoid

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

1848, of certain pipes in a gasworks, from by + pass. First used 1922 for "road for the relief of congestion;" fig. sense is from 1928. The heart operation was first so-called 1957.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bypass by·pass (bī'pās')

  1. A passage created surgically to divert the flow of blood or other bodily fluid or to circumvent an obstructed or diseased organ.

  2. A surgical procedure to create such a channel.

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
bypass   (bī'pās')  Pronunciation Key 

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A passage created surgically to divert the flow of blood or other bodily fluid or to circumvent an obstructed or diseased organ.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Both visitors and residents access beaches, fisheries, and recreational waters that maybe impacted bypast military training.
The failures caused bypast interventions are evidence that such intervention does not work.
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