English
knockstone
From knock + stone.
Proto-Indo-European *gnew- ‘to squeeze, pinch, ball up’
…
Proto-Germanic *knukōną ‘to knock’
Proto-West Germanic *knokōn
Old English cnocian ‘to knock, pound on, beat’
Middle English knokken
English knock
Proto-Indo-European *steyh₂- ‘to stiffen’
…
Proto-Germanic *stainaz
Proto-West Germanic *stain
Old English stān
Middle English ston ‘a stone’
English stone
Today it means
noun A block upon which ore is broken up.
Language periods are conventional ranges, not dates for this word.
Etymograph / knockstone