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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).
Also, sy-, syl-, sym-, sys-.
Origin of syn-
< Greek, combining form representing sýn with, together with

syn. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for syn
Historical Examples
  • O, the men on guard said one of the ladies had seen demons, and that the syn had been sent for, to say incantations over her.

    Tara Philip Meadows Taylor
  • Gray states it to be only a distorted specimen of Vulsella, syn.

    A Conchological Manual George Brettingham Sowerby
  • The word syntax is derived from the Greek syn (with or together) and taxis (arrangement).

    A Handbook of the English Language Robert Gordon Latham
  • "Come, syn; I will lead thee in," said the secretary, taking his hand.

    Tara Philip Meadows Taylor
  • The reddish amphibole-granite of syn, which was taken for all the Egyptian obelisks.

    The New York Obelisk Charles E. Moldenke
  • Hence is the saying that syn is set against it, when anyone tries to deny ought.

  • Asphodelus tauricus) has white flowers on stems about two feet high; and tenuior, now cretica (syn.

    The Book of Bulbs Samuel Arnott
  • And syn we knowen wel at many a man ha sout e fruit of blisfulnesse nat only wi suffryng of dee.

  • The eleventh is syn, who guards the door of the hall, and closes it against those who are not to enter.

  • Now an 2624 syn at alle inges ben requered for e grace of good.

British Dictionary definitions for syn


/saɪn; sɪn/
adverb, preposition, conjunction
a variant of syne1


with or together: synecology
fusion: syngamy
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
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Word Origin and History for syn


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

Online Etymology Dictionary, © 2010 Douglas Harper
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syn in Medicine

syn- or sym-

  1. Together; with: synclonus.

  2. United: syncephaly.

  3. Same; similar: synteny.

  4. At the same time: synesthesia.

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

1. Synchronous idle.
2. A syntactic specification language for COPS.
["Metalanguages of the Compiler Production System COPS", J. Borowiec, in GI Fachgesprach "Compiler-Compiler", ed W. Henhapl, Tech Hochs Darmstadt 1978, pp. 122-159].
3. [TCP/IP SYN request?]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Related Abbreviations for syn


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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