peripheral device

peripheral unit

noun
  1. computing any device, such as a disk, printer, modem, or screen, concerned with input/output, storage, etcOften shortened to: peripheral
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