Where does “bipennifer” come from?

bipennifer (Latin) comes from Latin bipennis, from Latin penna, from Proto-Italic petnā, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

bipennifer (Latin): bearing a two-edged axe

Definitions

bearing a two-edged axe

Ancestry of “bipennifer”, step by step

Step	Language	Word	Meaning
1	Latin	bipennis	two-edged; two-winged
2	Latin	penna	wing; feather, especially a flight-feather;...
3	Proto-Italic	petnā	feather; wing
4	Proto-Indo-European	péth₂r̥	wing; feather
5	Proto-Indo-European	peth₂-	to spread out; to fly

Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European péth₂r̥ →Every word from Proto-Italic petnā →