Emily Dickinson Lexicon

STACK, n. [W. ystac, a stack; ystaca, a standard, from tâg, a state of being stuffed; Dan. stak, a pile of hay; Sw. stack; Ir. stacadh. It signifies that which is set, and coincides with Sax. stac, D. staak, a stake. Stock, stag, stage, are of the same family, or at least have the same radical sense.]

1. A large conical pile of hay, grain or straw, sometimes covered with thatch. In America, the stack differs from the cock only in size, both being conical. A long pile of hay or grain is called a rick. In England, this distinction is not always observed. This word in Great Britain is sometimes applied to a pile of wood containing 108 cubic feet, and also to a pile of poles; but I believe never in America. Against every pillar was a stack of billets above a man's highth. – Bacon.
2. A number of funnels or chimneys standing together. We say, a stack of chimneys; which is correct, as a chimney is a passage. But we also call the whole stack a chimney. Thus we say, the chimney rises ten feet above the roof.