CMOS stands for C omplimentary M etal- O xide S emiconductor. It is a special RAM Chip which stores vital settings about your PC - such as the size of the Hard Disk & the amount & type of Memory . This information is stored even when the PC is switched off.
CMOS
Meaning of CMOS in English
English glossary of Internet and PC terminology. Английский глоссарий Интернет и ПК терминологии. 2012