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
British Dictionary definitions for syn-

syn-

prefix
1.
with or together: synecology
2.
fusion: syngamy
Word Origin
from Greek sun together, with
Word Origin and History for syn-

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

syn- in Medicine

syn- or sym-
pref.

  1. Together; with: synclonus.

  2. United: syncephaly.

  3. Same; similar: synteny.

  4. At the same time: synesthesia.