Definition of "thumbwheel" [thumbwheel]

• A small thumb-operated wheel on a mechanical or electronic device. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "ASTON, PENNSYLVANIA, U.S.A.: A touchscreen control now available for the Maguire® Weigh Scale Blender provides the same intuitive access as the company's widely used "thumbwheel" controller, plus fast response to operator inputs and an array of capabilities for meeting the requirements of processing jobs that are especially challenging, it was announced today by Maguire Products, Inc."
• "Instead of trying to find a specific song on your iPod by turning the thumbwheel, you simply speak it."
• "           Smile, feel the thumbwheel of the lighter against my index finger."