English

lockplate

From lock + plate.

A compound of lock + plate

Proto-Indo-European *lewg- ‘to bend’

Proto-Germanic *luką

Proto-West Germanic *lok ‘shutter’

Old English loc

Middle English lok

English lock

Proto-Indo-European *pleth₂- ‘flat’

…

Vulgar Latin *plattus ‘flat’

Medieval Latin plata

Old French plate ‘a flat metal disk’

Middle English plate

English plate

Today it means

noun The plate that covers the lockwork of a gun.

Language periods are conventional ranges, not dates for this word.

Etymograph / lockplate