Definition of sound card in US English:
 sound card
nounˈsaʊnd ˌkɑrdˈsound ˌkärd
A device which can be slotted into a computer to allow the use of audio components for multimedia applications.
 Example sentencesExamples
-  In the past, people used to buy plenty of add-on computer cards to boost their computers' functions - sound cards, graphic cards, modem cards, USB connectivity cards and so on.
 -  Another feature enables users so inclined to connect their PC sound card to their TV audio output.
 -  Let's be honest, though; games drive the hardware industry, particularly in graphics cards, sound cards and processors.
 -  You do need to make certain that your system is equipped with a good-quality video card and a sound card.
 -  All you need is your transceiver, a computer with a sound card and a program that supports the desired mode.