DOS 
(dŏs, dôs)
(dŏs, dôs)n.
Any of a family of operating systems that use command lines and were originally developed for personal computers made by IBM.
[D(ISK) O(PERATING) S(YSTEM).]
- livelily
- liveliness
- live load
- livelong
- lively
- liven
- liveness
- live oak
- live off/on the fat of the land
- live off the fat of the land
- live on the fat of the land
- live out
- live parking
- liver
- liver
- liver extract
- liver fluke
- liveried
- liverish
- liverishness
- liverleaf
- Livermore
- livermorium
- Liverpool
- Liverpudlian