From The Collaborative International Dictionary of English v.0.48 [gcide]:
Pile \Pile\, n. [AS. p[imac]l arrow, stake, L. pilum javelin;
but cf. also L. pila pillar.]
1. 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.
[1913 Webster]
Note: Tubular iron piles are now much used.
[1913 Webster]
2. [Cf. F. pile.] (Her.) One of the ordinaries or
subordinaries having the form of a wedge, usually placed
palewise, with the broadest end uppermost.
[1913 Webster]
{Pile bridge}, a bridge of which the roadway is supported on
piles.
{Pile cap}, a beam resting upon and connecting the heads of
piles.
{Pile driver}, or {Pile engine}, an apparatus for driving
down piles, consisting usually of a high frame, with
suitable appliances for raising to a height (by animal or
steam power, the explosion of gunpowder, etc.) a heavy
mass of iron, which falls upon the pile.
{Pile dwelling}. See {Lake dwelling}, under {Lake}.
{Pile plank} (Hydraul. Eng.), a thick plank used as a pile in
sheet piling. See {Sheet piling}, under {Piling}.
{Pneumatic pile}. See under {Pneumatic}.
{Screw pile}, one with a screw at the lower end, and sunk by
rotation aided by pressure.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
pile driver
n 1: a machine that drives piling into the ground
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