Where does “peninsula” come from?

peninsula (Latin) comes from Latin paeninsula, from Latin insula, from Latin in, from Old Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

peninsula (Latin): Alternative form of paenīnsula

Definitions

Alternative form of paenīnsula

Ancestry of “peninsula”, step by step

Step	Language	Word	Meaning
1	Latin	paeninsula	peninsula
2	Latin	insula	island; insula, a residential or apartment block...
3	Latin	in	in, at, on, upon, from; within, while in; into,...
4	Old Latin	en	in
5	Proto-Italic	en	in
6	Proto-Indo-European	h₁én	in

Every word from Proto-Indo-European h₁én →Every word from Proto-Italic en →Every word from Old Latin en →