Definition of Scotch-Irish in US English:

Scotch-Irish

adjective

  • 1Celtic History= Scots-Irish. rare before late 19th cent.

  • 2Chiefly North American. Designating Ulster Scots settlers in North America; of, belonging to, or descended from these settlers; (occasionally) designating the Ulster Scots themselves.

noun

  • 1Chiefly North American. Ulster Scots people in North America or in the north of Ireland considered collectively.

  • 2Celtic History= Scots-Irish. rare.

Origin

Early 17th century; earliest use found in Michael Drayton (1536–1631), poet. From Scotch + Irish. With senses A. 1 and B. 3 compare earlier Irish Scot.

Pronunciation

Scotch-Irish

/skɒtʃˈʌɪrɪʃ/