bunion

詳細解釋：

bun.ion

n.（名詞）
A painful, inflamed swelling of the bursa at the first joint of the big toe, characterized by enlargement of the joint and lateral displacement of the toe.
拇趾囊腫脹：大拇趾第一關節處疼痛的，發炎的囊腫，特徵是關節腫大，然後拇趾移位

來源：
Probably alteration of obsolete bunny [swelling]
可能為 廢語 bunny的變化 [腫脹]
from Middle English bony
源自 中古英文 bony
perhaps from Old French bugne * see bun
可能源自 古法文 bugne *參見 bun