Definition - Another more literary name for both Scottish and Irish Gaelic.

Etymology -
The word was coined as a Scottish variant of the Old English Irisc, Irish. For some reason, it became the name that Lowland Scots called the Gaelic speech of the Highland Scots.

Oxford English Dictionary -
Its first citation is from about 1375:
"Thow Scot, abyde … Ane Ersche mantill it war thi kynd to wer."
(1470 Henry Wallace i. 217)

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