universal serial bus: an external serial bus interface standard for connecting peripheral devices to a computer, as in USB port; USB cable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
computing a type of serial port for connecting peripheral devices in a system
Universal Serial Bus: a standard for connection sockets on computers and other electronic equipment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
initialism for universal serial bus, by 1994.
Online Etymology Dictionary, © 2010 Douglas Harper