follow Dictionary.com

Why is the ninth month called September?

syn-

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).
Also, sy-, syl-, sym-, sys-.
Origin
< Greek, combining form representing sýn with, together with
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for syn-

syn-

prefix
1.
with or together synecology
2.
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
Cite This Source
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
Cite This Source
syn- in Medicine

syn- or sym-
pref.

  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.
Cite This Source

Word of the Day

Difficulty index for syn-

Few English speakers likely know this word

Word Value for syn

6
6
Scrabble Words With Friends