a stone or other heavy weight used for grinding artists' pigments or other material on a slab
研杵。
Hermann Joseph (1890—1967), American geneticist. He discovered that X-rays induce mutations in the genetic material of the fruit fly
马勒,赫尔曼·约瑟夫(1890— 1967,美国遗传学家,发现X射线可导致果蝇遗传物质发生突变,从而证实了X射线对生物体的危险性,获1946年诺贝尔生理学或医学奖)。
"late Middle English: perhaps from Anglo-Norman French