• synonyms


  1. a prefix occurring in loanwords from Greek, having the same function as co- (synthesis; synoptic); used, with the meaning “with,” “together,” in the formation of compound words (synsepalous) or “synthetic” in such compounds (syngas).
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Also sy-, syl-, sym-, sys-.

Origin of syn-

< Greek, combining form representing sýn with, together with


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for syn

Historical Examples

  • The reddish amphibole-granite of Syn, which was taken for all the Egyptian obelisks.

    The New York Obelisk

    Charles E. Moldenke

  • Gray states it to be only a distorted specimen of Vulsella, Syn.

    A Conchological Manual

    George Brettingham Sowerby

  • The more free wee are to syn, the more slaves are wee to Sathan.

  • "Come, Syn; I will lead thee in," said the secretary, taking his hand.


    Philip Meadows Taylor

  • Hence is the saying that syn is set against it, when anyone tries to deny ought.

British Dictionary definitions for syn


adverb, preposition, conjunction
  1. a variant of syne 1
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abbreviation for
  1. synonym(ous)
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  1. with or togethersynecology
  2. fusionsyngamy
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Word Origin

from Greek sun together, with
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 syn


word-forming element meaning "together with," from Greek syn "with, together with," of unknown origin.

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Online Etymology Dictionary, © 2010 Douglas Harper

syn in Medicine


  1. Together; with:synclonus.
  2. United:syncephaly.
  3. Same; similar:synteny.
  4. At the same time:synesthesia.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.