Where does “syncline” come from?

syncline (English) comes from English syn, from English synonym, from Middle English sinonyme, from Latin synōnymum, from Ancient Greek συνώνυμος, from Ancient Greek σῠν-, from Ancient Greek σύν, from Proto-Hellenic *ksún — beside, with.

syncline (English): A concave-upward fold in rock strata

Definitions

  1. A concave-upward fold in rock strata

Ancestry of “syncline”, step by step

syncline traces back through two separate lines of ancestry.

via English syn

StepLanguageWordMeaning
1EnglishsynThat has a torsion angle between 0° and 90°
2EnglishsynonymA word whose meaning is the same as that of...
3Middle Englishsinonyme
4Latinsynōnymumsynonym
5Ancient GreekσυνώνυμοςHaving the same name; Having only one meaning:...
6Ancient Greekσῠν-together; with, together
7Ancient Greekσύνbeside, with
8Proto-Hellenic*ksúnbeside, with

via English cline

StepLanguageWordMeaning
1EnglishclineA gradation in a character or phenotype within a...
2Ancient Greekκλῑ́νωto decline; I bend, lean
Every word from Proto-Hellenic *ksún