名詞 ferule:

1. a switch (a stick or cane or flat paddle) used to punish children

fer.ule

n.（名詞）
An instrument, such as a cane, stick, or flat piece of wood, used in punishing children.
戒尺，教鞭：一種用以懲罰孩子的工具，如笞條、棍子或扁平的木條
v.tr.（及物動詞）
fer.uled,fer.ul.ing,fer.ules
To punish with a ferule.
用戒尺毒打

來源：
Middle English ferul [fennel stalk]
中古英語 ferul [茴香莖]
from Latin ferula [fennel stalk, rod]
源自 拉丁語 ferula [笞條，笞鞭]