Where does “aβ̃-” come from?

aβ̃- (Proto-Brythonic) comes from Proto-Celtic am-, from Proto-Celtic an-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “aβ̃-”, step by step

StepLanguageWordMeaning
1Proto-Celticam-—
2Proto-Celtican-un-, not
3Proto-Indo-Europeann̥-not, un-
4Proto-Indo-Europeannenot

Words derived from “aβ̃-”

Every word from Proto-Indo-European ne →Every word from Proto-Indo-European n̥- →Every word from Proto-Celtic an- →