concealeddial
nounUK /kənˈsiːld daɪəl/
US /kənˈsiːld daɪəl/
A hidden dial that you turn to change something.
He found the concealed dial behind the clock and turned it to open the secret door.
OTHER MEANINGS
2. A dial that is hard to see because it blends into the surface around it.
The concealed dial on the radio looked just like part of the case.
3. A secret setting that only certain people know how to adjust.
Only the engineer knew where the concealed dial was on the machine.
4. A small turning part kept out of sight for safety.
The toy's concealed dial keeps little hands from changing the settings.