| Subject | English | Welsh |
| comp., MS | left mouse button | botwm chwith llygoden (The button on your pointing device that you use most often for clicking and double-clicking) |
| comp., MS | mouse button | botwm llygoden (A movable piece on a device that is pressed to activate some function) |
| comp., MS | primary mouse button | prif fotwm y llygoden (The button on your pointing device that you use most often for clicking and double-clicking) |
| comp., MS | right mouse button | botwm de llygoden (The button on your pointing device that you use to display shortcut menus or other program-specific features) |