What is "edrington"

Edrington is a medieval estate occupying the lower part of Mordington parish in Berwickshire, Scottish Borders, Scotland, five miles (8 km) west of Berwick-upon-Tweed. From probably the 14th century, if not earlier, a castle occupied the steep hill above the mill of the same name on the Whiteadder Water. The castle ruin is still marked on today's Ordnance Survey maps, and still appears in locality references in The Berwickshire News. The principal farm of the estate is Edrington Mains.