Where does “syndiagenetic” come from?

syndiagenetic (English) comes from English diagenetic, from English dia-, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

syndiagenetic (English): Happening at the same time as diagenesis ("the changes sediment goes through during and after lithification")

Definitions

Happening at the same time as diagenesis ("the changes sediment goes through during and after lithification")

Ancestry of “syndiagenetic”, step by step

Step	Language	Word	Meaning
1	English	diagenetic	of, or relating to diagenesis
2	English	dia-	through, across, between
3	Ancient Greek	δῐᾰ-	apart; through, across; through; in different...
4	Ancient Greek	διά	throughout
5	Proto-Indo-European	dwís	twice, doubly; in two
6	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from Ancient Greek δῐᾰ- →Every word from Proto-Indo-European dwís →