SCSI: n.

[Small Computer System Interface] A bus-independent standard for system-level interfacing between a computer and intelligent devices. Typically annotated in literature with ‘sexy’ (/sek see/), ‘sissy’ (/sis ee/), and ‘scuzzy’ (/skuh zee/) as pronunciation guides — the last being the overwhelmingly predominant form, much to the dismay of the designers and their marketing people. One can usually assume that a person who pronounces it /S-C-S-I/ is clueless.