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
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  with or together: synecology
2.  fusion: syngamy
[from Greek sun together, with]

Collins English Dictionary - Complete & Unabridged 10th Edition
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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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