plural BIOSes
computers
: a software element of a computer operating system that allows the CPU to communicate with connected input and output devices (such as a keyboard or a monitor)
Your PC contains several BIOSes—the video BIOS that interfaces your CPU and video card, for example—but the most fundamental is the system BIOS.—
Neil Randall
Neil RandallExamples of BIOS in a Sentence
Recent Examples on the Web
Instead of targeting machines through the BIOS or master boot record, one such bootkit attacked Mac OS X systems by infecting the EFI, a package of firmware that started the boot process.
—
Dan Goodin,
ArsTechnica,
17 June 2026
Asus has launched a beta BIOS for its Crosshair X870E motherboards that may be the first to support AMD EXPO Ultra Low Latency (ULL), VideoCardz reports.
—
Jon Martindale,
PC Magazine,
10 June 2026
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Dan Goodin,
ArsTechnica,
17 June 2026
Asus has launched a beta BIOS for its Crosshair X870E motherboards that may be the first to support AMD EXPO Ultra Low Latency (ULL), VideoCardz reports.
—
Jon Martindale,
PC Magazine,
10 June 2026
Cite this Entry
“BIOS.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/BIOS. Accessed 5 Jul. 2026.
Copy CitationMedical Definition
bios
noun
bi·os
ˈbī-ˌäs 
: a mixture of vitamins of the B complex essential for the optimum growth of some yeasts
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