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-.

< Greek, combining form representing sýn with, together with Unabridged Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
syn (saɪn, sɪn)
adv, —prep, —conj
a variant of syne

abbreviation for

1.  with or together: synecology
2.  fusion: syngamy
[from Greek sun together, with]

syne or syn1 (səɪn)
adv, —prep, —conj
a Scot word for since
[C14: probably related to Old English sīth since]
syn or syn1
adv, —prep, —conj
[C14: probably related to Old English sīth since]

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

prefix meaning "together with," from Gk. syn "with, together with," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Computing Dictionary

SYN definition

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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American Heritage
Abbreviations & Acronyms
  1. synonym

  2. synonymous

  3. synonymy

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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