gallowglass noun1 •(historical) A mercenary warrior élite among Gaelic-Norse clans residing in the Western Isles of Scotland and Scottish Highlands from the mid 13th century to the end of the 16th century.The multiplying villanies of nature / Do swarm upon him--from the western isles/ Of kerns and gallowglasses is supplied. — 1606 formsgallowglasses
