Definition of thumbwheel in English:

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thumbwheel

Pronunciation: /ˈTHəmˌ(h)wēl/

noun

A control device for electrical or mechanical equipment in the form of a wheel operated with the thumb.
Example sentences
  • You can also use a thumbwheel to toggle between programs or launch new ones.
  • The monochrome screen is easy to read, and the clickable thumbwheel control permits scrolling through programming and feature menus readily enough.
  • But the thumbwheel makes you feel like you're in control.

For editors and proofreaders

Syllabification: thumb·wheel

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