quire

quire
/ˈkwaɪə(r); kwaɪr/ n
25 (formerly 24) sheets of paper （纸的）一刀（25张纸, 旧时为24张）
    buy/sell paper by the quire/in quires 按刀数买[卖]纸. Cf 参看 ream 1.

牛津英汉双解词典