Краткий толковый словарь по полиграфии. 2010.
keybutton — noun Date: circa 1920 key 5c … New Collegiate Dictionary
keybutton — key·button … English syllables
keybutton — ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun : any of the small buttons or knobs depressed by the fingers in operating a keyboard machine … Useful english dictionary