simple past tense and past participle of backfit

(chemistry, historical) Oxygen gas, as originally thought to be air deprived of phlogiston (“the hypothetical fiery principle formerly assumed to be a necessary constituent of combustible bodies an...

Intense fanatical enthusiasm for the The Beatles.

Someone who is skilled in their trade; an artisan. / An inventor. / A member of the military who specializes in manufacturing and repairing weapon systems. / A trickster. / A savant.