The Nuttall Encyclopedia
A Scotch dish, "great chieftain o' the puddin' race," composed of the chopped lungs, heart, and liver of a sheep, mixed with suet and oatmeal, seasoned with onions, pepper, salt, &c., and boiled in a sheep's stomach.
Wood, James, ed. Entry for 'Haggis'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/h/haggis.html. Frederick Warne & Co Ltd. London. 1900.