Noun
(computing) A hard plastic or rubbery disc on a computer mouse, used for scrolling.
(engineering) A cog wheel in the form of a scroll.
Source: en.wiktionary.orgAs for buttons, it has one left and one right button, one scroll wheel that is clickable, one DPI shift button placed in the center along with 3 additional buttons on both sides. Source: Internet
Clicking and dragging is the equivalent of scrolling, and so is a scrolling gesture (via a two-finger gesture on a trackpad or via a scroll wheel on your mouse, for example). Source: Internet
Code reuse saves developers time and labor by preventing them from having to reinvent the wheel every time an app needs a scroll wheel or date picker. Source: Internet
For instance, if you want the scroll wheel to act as a shortcut for the W and S keys, you can make that happen here. Source: Internet
Gave me 50% off a G400 when i told them my 7 year old MX518's scroll wheel was dying. Source: Internet
Logitech’s signature metal Hyper scroll wheel is still there, now cored out to weigh a few grams less. Source: Internet