Small Computer Systems Interface. A specification of mechanical and electrical standards for connecting certain peripheral devices such as CD-ROM drives, external storage drives, and scanners to a computer. SCSI has been replaced by USB and FireWire on newer Macintosh models.
Acronym for Small Computer Systems Interface. An industry standard interface that provides high-speed access to peripheral devices such as hard disk drives, optical discs, WORM drives, etc.
Small Computer System Interface. An interface that amounts to a complete expansion bus, into which you can plug devices such as hard disk drives, CD-ROM drives, scanners, and laser printers.