Stack (stăk), n. [Icel. stakkr; akin to Sw. stack, Dan. stak. Cf. Stake.] 1. A large pile of hay, grain, straw, or the like, usually of a nearly conical form, but sometimes rectangular or oblong, contracted at the top to a point or ridge, and sometimes covered with thatch.
But corn was housed, and beans were in the stack. Cowper.
2. A pile of poles or wood, indefinite in quantity.
Against every pillar was a stack of billets above a man's height. Bacon.
3. A pile of wood containing 108 cubic feet.
4. (Arch.) (a) A number of flues embodied in one structure, rising above the roof. Hence: (b) Any single insulated and prominent structure, or upright pipe, which affords a conduit for smoke; as, the brick smokestack of a factory; the smokestack of a steam vessel.
Stack of arms(Mil.), a number of muskets or rifles set up together, with the bayonets crossing one another, forming a sort of conical self-supporting pile.