"chad"--a possible origin

[Barnhart]

douglas at NB.NET,Net writes:
>The origin from Scots "chad" =
>"gravel" offered in Webster's Third (1961) seems reasonable to me.

This is true.  But, in subsequent publications they (MW) have preferred
"origin unknown."  So, too: OED-as #1 and AHD.

I'd like to know more about the MW 1947 quote.

Regards,
David Barnhart

David K. Barnhart, Editor
The Barnhart Dictionary Companion [quarterly]
barnhart at highlands.com
www.highlands.com/Lexik

"Necessity obliges us to neologize."
Thomas Jefferson-August 16, 1813