English
ampere-turn
From ampere + turn.
Proto-Indo-European *terh₁- ‘to rub, rub by turning, turn’
…
Latin tornō ‘to round off, turn in a lathe’
Proto-West Germanic *turnēn ‘to turn, lathe’
Old English turnian ‘to turn, rotate’
Middle English turnen ‘to turn’
English turn
Today it means
noun The unit of magnetomotive force.
Language periods are conventional ranges, not dates for this word.
Etymograph / ampere-turn