Definition of sumas:
(n) :
A district of Abbotsford, British Columbia, Canada.
(n) :
A city in Whatcom County, Washington state, United States.
(n) :
A flatland in the Fraser Lowland region, shared between British Columbia, Canada and Whatcom County, Washington, United States.
(n) :
A former district municipality of British Columbia, Canada, that was merged into the city of Abbotsford.
(n) :
Ellipsis of Sumas Prairie:
(n) :
A river in the Fraser Lowland region, whose headwaters originate on American Sumas and flows through British Columbia, Canada and Whatcom County, Washington, United States; in full, Sumas River.