a hair; hence, the fiber of wool, cotton, and the like; also, the nap when thick or heavy, as of carpeting and velvet.-a covering of hair or fur.-the head of an arrow or spear.-a large stake, or piece of timber, pointed and driven into the earth, as at the bottom of a river, or in a harbor where the ground is soft, for the support of a building, a pier, or other superstructure, or to form a cofferdam, etc.-one of the ordinaries or subordinaries having the form of a wedge, usually placed palewise, with the broadest end uppermost.-to drive piles into; to fill with piles; to strengthen with piles.-a mass of things heaped together; a heap; as, a pile of stones; a pile of wood.-a mass formed in layers; as, a pile of shot.-a funeral pile; a pyre.-a large building, or mass of buildings.-same as fagot, n., 2.-a vertical series of alternate disks of two dissimilar metals, as copper and zinc, laid up with disks of cloth or paper moistened with acid water between them, for producing a current of electricity; -- commonly called volta's pile, voltaic pile, or galvanic pile.-the reverse of a coin. see reverse.-to lay or throw into a pile or heap; to heap up; to collect into a mass; to accumulate; to amass; -- often with up; as, to pile up wood.-to cover with heaps; or in great abundance; to fill or overfill; to load.