Where does “birda” come from?

birda (Esperanto) comes from Esperanto -a, from Italian -a, from Latin -a, from Proto-Italic -ā, from Proto-Indo-European -éh₂.

birda (Esperanto): avian

Definitions

Step	Language	Word	Meaning
1	Esperanto	-a	Related to, in the manner of, of; Belonging to,...
2	Italian	-a	Used, with a stem, to form the third-person...
3	Latin	-a	suffixed to the roots of verbs, forms agent...
4	Proto-Italic	-ā	—
5	Proto-Indo-European	-éh₂	—

birda — Etymology, Origin & Word History | Etymology Explorer