n. 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 GNU version of the Collaborative International Dictionary of English
n. A heavy-armed foot soldier from Ireland and the Western Isles in the time of Edward �
The Century Dictionary and Cyclopedia
n. A soldier or armed retainer of a chief in ancient Ireland, the Hebrides, or other Gaelic countries.
Word Usage
"Trouble is, the enigmatic and gorgeous Luke turns out to be a gallowglass—a soulless faerie assassin."