noun
ground stone tool; polished stone tool
Archaeological term for stone tools shaped by grinding and polishing, as opposed to chipped stone tools (打製石器).
磨製石器は、縄文時代に広く使われた。
Ground stone tools were widely used in the Jomon period.
打製石器 are chipped stone tools made by flaking, while 磨製石器 are ground or polished stone tools.
From 磨製 (grinding/polishing manufacture) + 石器 (stone tool). The exact historical derivation is uncertain; the term is a modern archaeological classification.