• synonyms


[bahy-past, -pahst]
  1. bygone; earlier; former; past.
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  1. a past participle of bypass.
  2. Rare. a simple past tense of bypass.
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Origin of bypast

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


or by-pass

[bahy-pas, -pahs]
  1. a road enabling motorists to avoid a city or other heavy traffic points or to drive around an obstruction.
  2. a secondary pipe or other channel connected with a main passage, as for conducting a liquid or gas around a fixture, pipe, or appliance.
  3. Electricity. shunt(def 9).
  4. 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.
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verb (used with object), by·passed or (Rare) by·past; by·passed or by·past; by·pass·ing.
  1. to avoid (an obstruction, city, etc.) by following a bypass.
  2. to cause (fluid or gas) to follow a secondary pipe or bypass.
  3. to neglect to consult or to ignore the opinion or decision of: He bypassed the foreman and took his grievance straight to the owner.
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Origin of bypass

1840–50; apparently back formation from by-passage; see by1 (adj.), passage1
Related formsby·pass·er, by-pass·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

omit, circumvent, sidestep, ignore, skirt, neglect, circumnavigate, outflank, finesse, detour, burke

Examples from the Web for bypast

Historical Examples

  • As for the King, he has been hampered for about a month bypast on account of the continual rain.

    Letters of John Calvin, Volume I (of 4)

    Jules Bonnet

  • The vague apprehensions of bypast years reviving at this crisis, some neighbours had been on the outlook for a catastrophe.

  • It's no mony months bypast; it was a lang courtship,—few folk kend the reason by Jenny and mysell.

British Dictionary definitions for bypast


  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
    1. the redirection of blood flow, either to avoid a diseased blood vessel or in order to perform heart surgerySee coronary bypass
    2. (as modifier)bypass surgery
  5. electronics
    1. an electrical circuit, esp one containing a capacitor, connected in parallel around one or more components, providing an alternative path for certain frequencies
    2. (as modifier)a bypass capacitor
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verb -passes, -passing, -passed or -past (tr)
  1. to go around or avoid (a city, obstruction, problem, etc)
  2. to cause (traffic, fluid, etc) to go through a bypass
  3. to proceed without reference to (regulations, a superior, etc); get round; avoid
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for bypast



also by-pass, 1848, of certain pipes in a gasworks, from by + pass (n.). First used 1922 for "road for the relief of congestion;" figurative sense is from 1928. The heart operation was first so called 1957.

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1823, "to pass by" (implied in bypassed), from bypass (n.). From 1928 as "to go around, avoid;" figurative use from 1941. Related: Bypassed; bypassing.

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Online Etymology Dictionary, © 2010 Douglas Harper

bypast in Medicine


  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

bypast in Science


  1. A passage created surgically to divert the flow of blood or other bodily fluid or to circumvent an obstructed or diseased organ.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.