一切經音義 54.54

54.54

如砥（又作底同之視反底平也直也尚書礪砥砮石孔安國曰砥細於礪皆磨石也砮音乃乎反）。

如砥 (Also written as 底, the same; fanqie 之 + 視. 底 means flat and straight. The Shangshu has: "礪, 砥, and flint stones." Kong Anguo says: "A 砥 whetstone is finer than a 礪; both are grindstones." 砮 is fanqie 乃 + 乎).