operation code 
noun Computing
The part of a machine code instruction that defines the operation to be performed.Send both numbers and the operation code to the execution unit.
- full-bodied
- full bore
- full-bottomed
- full-breasted
- full-bred
- full brother
- full colour
- full-court press
- full-cream
- full dress
- full dress uniform
- full employment
- full English breakfast
- fuller
- fullerene
- Fuller, Margaret
- Fuller, Melville Weston
- Fuller, R. Buckminster
- fuller's earth
- fuller's teasel
- Fuller, Thomas
- Fullerton
- full face
- full-fashioned
- full-figured