Where does “introrsum” come from?

introrsum (Latin) comes from Latin versus, from Latin vertō, from Proto-Italic wertō, from Proto-Indo-European wert-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

introrsum (Latin): inwards; inwardly; within, internally

Definitions

inwards; inwardly; within, internally

Ancestry of “introrsum”, step by step

introrsum traces back through two separate lines of ancestry.

via Latin versus

Step	Language	Word	Meaning
1	Latin	versus	turned, changed, having been turned; towards,...
2	Latin	vertō	to turn, turn oneself, direct one's way, to turn about, turn around, revolve
3	Proto-Italic	wertō	to turn
4	Proto-Indo-European	wert-	to turn, to rotate
5	Proto-Indo-European	wer-	to burn; to cover, heed, notice; squirrel

via Latin intrō

Step	Language	Word	Meaning
1	Latin	intrō	to enter, go into, come in, get in, penetrate
2	Latin	intra	within; inside; during; less than
3	Latin	interus	—
4	Proto-Indo-European	h₁énteros	inside, within
5	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Every word from Proto-Indo-European wer- →Every word from Proto-Indo-European wert- →Every word from Proto-Italic wertō →