BIOS Definition

bīōs
noun
The set of routines stored in read-only memory that enable a computer to start the operating system and to communicate with the various devices in the system, such as disk drives, keyboard, monitor, printer, and communications ports.
American Heritage

Plural form of bio.

Wiktionary
abbreviation
Basic input/output system.
Webster's New World
(computing) Built-in operating system.
Wiktionary
(computing) Basic input/output system.
Wiktionary

Origin of BIOS

  • b(asic) i(nput/)o(utput) s(ystem)

    From American Heritage Dictionary of the English Language, 5th Edition

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BIOS