English
Forstner bit
From Forstner (proper noun) + bit (noun).
first attested First attested after 1886 (as stated in the etymology)
The story
Named after American inventor, gunsmith and merchant Benjamin Forstner (1834–1897). First attested after 1886.
Today it means
noun A kind of drill bit that bores precise flat-bottomed holes in wood, in any orientation with respect to the grain.
Language periods are conventional ranges, not dates for this word.
Etymograph / Forstner bit