(same as 厎 砥) to apply knowledge to final causes; to extend knowledge to the utmost, equally; average, smooth
?【子集下】【廠部】 康熙筆畫：6畫，部外筆畫：4畫
《字彙補(bǔ)》之是切，音智。致也，均也，平也，聲也。《海篇》同厎。
