expansion slot

from WordNet (r) 3.0 (2006)

expansion slot
    n 1: (computer) a socket in a microcomputer that will accept a
         plug-in circuit board; "the PC had three slots for
         additional memory" [syn: {slot}, {expansion slot}]

from The Free On-line Dictionary of Computing (8 July 2008)

expansion slot

   <hardware> A connector in a computer into which an {expansion
   card} can be plugged.  The connector supplies power to the
   card and connects it to the {data bus}, {address bus} and
   control signals of the {motherboard}.

   (1998-06-26)