Ettrick, a Scottish river that rises in Selkirkshire and joins the Tweed, 3 m. below Selkirk; the Yarrow is its chief tributary; a forest of the same name once spread over all Selkirkshire and into the adjoining counties; the district is associated with some of the finest ballad and pastoral poetry of Scotland.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Ettmüller, Ernst Moritz Ludwig * Ettrick Shepherd