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.-a pile of poles or wood, indefinite in quantity.-a pile of wood containing 108 cubic feet.-a number of flues embodied in one structure, rising above the roof. hence:-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.-a section of memory in a computer used for temporary storage of data, in which the last datum stored is the first retrieved.-a data structure within random-access memory used to simulate a hardware stack; as, a push-down stack.-to lay in a conical or other pile; to make into a large pile; as, to stack hay, cornstalks, or grain; to stack or place wood.