The Collaborative International Dictionary of English v.0.48:
Socket \Sock"et\, n. [OE. soket, a dim. through OF. fr. L.
soccus. See Sock a covering for the foot.]
1. An opening into which anything is fitted; any hollow thing
or place which receives and holds something else; as, the
sockets of the teeth.
His eyeballs in their hollow sockets sink. --Dryden.
2. Especially, the hollow tube or place in which a candle is
fixed in the candlestick.
3. (Electricity) the receptacle of an electric lamp into
which a light bulb is inserted, containing contacts to
conduct electricity to the bulb.
4. (Electricity) the receptacle fixed in a wall and connected
by conductive wiring to an electrical supply, containing
contacts to conduct electricity, and into which the plug
of an electrical device is inserted; -- called also a
wall socket or outlet. The socket will typically have
two or three contacts; if three, the third is connected to
a ground for safety.
And in the sockets oily bubbles dance. --Dryden.
Socket bolt (Mach.), a bolt that passes through a thimble
that is placed between the parts connected by the bolt.
Socket chisel. Same as Framing chisel. See under
Socket pipe, a pipe with an expansion at one end to receive
the end of a connecting pipe.
Socket pole, a pole armed with iron fixed on by means of a
socket, and used to propel boats, etc. [U.S.]
Socket wrench, a wrench consisting of a socket at the end
of a shank or rod, for turning a nut, bolthead, etc., in a
narrow or deep recess.