n A large pile of hay, grain, straw, or the like, larger at the bottom than the top, sometimes covered with thatch.
n (computing) A linear data structure in which the last datum stored is the first retrieved; a LIFO queue.
n (computing) A portion of computer memory occupied by a 'stack' data structure, particularly ('the stack') that portion of main memory manipulated during machine language procedure call related instructions.
n (context|library) Compactly spaced bookshelf | bookshelves used to house large collections of books.
n (bodybuilding) A blend of various dietary supplements or anabolic steroids with supposed synergistic benefits.