English
lockful
From lock + -ful.
Formed from lock + -ful
Proto-Indo-European *lewg- ‘to bend’
Proto-Germanic *luką
Proto-West Germanic *lok ‘shutter’
Old English loc
Middle English lok
English lock
Today it means
noun Enough water to fill a canal lock.
Language periods are conventional ranges, not dates for this word.
Etymograph / lockful