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| Subject | English | Welsh |
| comp., MS | compact disc | cryno ddisg (An optical storage medium for digital data) |
| comp., MS | compact disc player | chwaraewr cryno ddisgiau (A device that reads the information stored on a compact disc. A compact disc player contains the optical equipment necessary for reading a disc's contents and the electronic circuitry for interpreting the data as it is read) |
| comp., MS | compact disc read-only memory | cryno ddisg cof darllen-yn-unig (A form of storage characterized by high capacity (roughly 650 MB) and the use of laser optics instead of magnetic means for reading data) |
| comp., MS | compact disc-recordable | cryno ddisg recordio (A type of CD-ROM that can be written (only once) on a CD recorder and read on a CD-ROM drive) |
| comp., MS | compact disc-rewritable | cryno ddisg ailysgrifennu (A type of CD on which files can be copied, erased, and replaced) |
| comp., MS | compact row axis | cywasgu echel rhes (A feature that enables the user to compact or collapse rows when viewing several levels of data) |