Where does “etiamtum” come from?

etiamtum (Latin) comes from Latin etiam, from Latin et, from Proto-Indo-European éti, from Proto-Indo-European h₁é, from Proto-Indo-European ǵʰe — Postpositional intensifying particle: indeed, at any rate, in fact.

etiamtum (Latin): even then, till that time, till then, still;...

Definitions

even then, till that time, till then, still;...

Ancestry of “etiamtum”, step by step

etiamtum traces back through two separate lines of ancestry.

via Latin etiam

Step	Language	Word	Meaning
1	Latin	etiam	and also, and furthermore, also, likewise,...
2	Latin	et	and; plus; though, even if
3	Proto-Indo-European	éti	beyond; over
4	Proto-Indo-European	h₁é	and, then
5	Proto-Indo-European	ǵʰe	Postpositional intensifying particle: indeed, at any rate, in fact

via Latin tum

Step	Language	Word	Meaning
1	Latin	tum	then, thereupon; at the time, at that time, then;...
2	Proto-Indo-European	tóm	—
3	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European ǵʰe →Every word from Proto-Indo-European h₁é →Every word from Proto-Indo-European éti →