What is the ど in やけど?


Given that やけど means "burn", it seems likely that the やけ part is 焼け. What
about the ど, though?

(The kanji for やけど - i.e. 火傷 - don't help, because those characters are
obviously 当て字, and would ordinarily be read かしょう.)




Shogakukan's _Kokugo Dai Jiten Dictionary_ backs up senshin's answer, listing
the following for the term's etymology:

> 「焼け処（ど）」の意。「やけと」とも  
>  Meaning 焼{や}け処{ど} ("burnt place"). Also read as _yaketo_




It looks like やけど derives from 焼け + 処, i.e. "burnt place", and was sometimes
also written 焼（け）所. cf. [語源由来辞典](http://gogen-allguide.com/ya/yakedo.html):

> やけどを漢字で「火傷」と表記するのは、意味からの当て字。  
>  やけどの「やけ」は「焼け」、「ど」は「所」「場所」などを意味する「処」で、「焼け処」が語源である。  
>  井原西鶴の浮世草子『好色二代男』に「脇腹を見たまへば、焼所ありありと」とある。

