
A strath is a large valley, typically a river valley that is wide and shallow (as opposed to a glen which is typically narrower and deep). An anglicisation of the Gaelic word srath, it is one of many that have been absorbed into common use in the English language. It is commonly used in rural Scotland to describe a wide valley, even by non-Gaelic ...
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http://en.wikipedia.org/wiki/Strath

• (n.) A valley of considerable size, through which a river runs; a valley bottom; -- often used in composition with the name of the river; as, Strath Spey, Strathdon, Strathmore.
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http://thinkexist.com/dictionary/meaning/strath/
Strath noun [ Gael.
srath .] A valley of considerable size, through which a river runs; a valley bottom; -- often used in composition with the name of the river; as,
Strath Spey,
Strath don,
Strath more. [ Scot.] « The long green
strath of Napa valley.» ...
Found on
http://www.encyclo.co.uk/webster/S/208

Strath is a cultivated variety of potato.
Found on
http://www.probertencyclopaedia.com/browse/QS.HTM

a wide valley.
Found on
https://www.infoplease.com/dictionary/strath
No exact match found.