expansion slot

Noun

1.

expansion slot - (computer) a socket in a microcomputer that will accept a plug-in circuit board; "the PC had three slots for additional memory" Synonyms: slot

(hardware)

expansion slot - 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.

computer, computing device, computing machine, data processor, electronic computer, information processing system, receptacle, slot