Definition of lough
1 chiefly Irish : lake
2 chiefly Irish : a bay or inlet of the sea
Origin and Etymology of lough
Middle English, of Celtic origin; akin to Old Irish loch lake; akin to Latin lacus lake — more at lake
First Known Use: 14th century
Seen and Heard
What made you want to look up lough? Please tell us where you read or heard it (including the quote, if possible).