axletree

n. 轮轴, 车轴

ax.le.tree

n.（名词）
A crossbar or rod supporting a vehicle, such as a cart, that has terminal spindles on which the wheels revolve.
车轴，轴干：支撑如二轮马车等交通工具的横梁或棍棒，轮子围绕其上的轴心末端转动

来源：
Blend of Middle English axel [axle] * see axle
混合了 中古英语 axel [轴] *参见 axle
Middle English axtre [axletree] ax from Old English eax tre [tree] * see tree
中古英语 axtre [轴平] ax 源自 古英语 eax tre [树] *参见 tree