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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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for syn-


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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