Synoptic Wikipedia
synoptic Merriam-Webster
thesaurus: synoptic thesaurus.com
Synoptic Paleoclimatology: The Weather Regime Approach from the Tropics to the PolesIan D Goodwin in press
Prefix syn-
syn- wiktionarysyn- wordreference.com
Words Starting with SYN Merriam=Webster
Origin and history of syn- etymonline.com
Writing With Prefixes: Greek Syn righttouchediting.com
syn- from Affixes (Michael Quinion)