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bunion

/ˈbʌnjən/

Painful swelling and deformity at the big-toe joint

From French, ultimately Germanic bunion (A lump or swelling).

noun
bunion
Proto-Germanic
Verified
*bungô
reconstructed
“lump, clump, heap, crowd”

from Proto-Germanic *bungô, *bunkô (“lump, clump, heap, crowd”)

Old French
Verified
bugne, buigne, bune
“bump, knob, swelling”; the principal Romance form in the word’s transmission

from French buigne "bump on the head, swelling

+1 more source
Middle English
Verified
bony, boni
“bunion, swelling,” later altered to bunny in East Anglian speech and then bunion

from Middle English bony, boni (“bunion, swelling”), perhaps Italian bubbone (augmented form of bugno (“beehive”)), or...

Modern English
bunion

Before it became a medical nuisance, this word was simply a name for a bump. Middle English speakers used bony or boni for a swelling, and the trail seems to run through Old French bugne, “a lump or knob,” with competing proposals involving Old Norse bunga and Italian bubbone. By 1718, East Anglian bunny—another word for a lump—had been reshaped into bunion, a surprisingly cute label for an increasingly uncomfortable anatomical bulge. The rabbit word bunny may be related in sound and history, but its exact ancestry is disputed, so the connection is more family resemblance than courtroom proof. A bunion is therefore, etymologically, a tiny “thick lump” wearing a medical name: remember the bump, and the word practically explains itself.

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