The definition of an auger is a tool used for drilling either used independently in a brace or attached to a larger mechanism.(noun)
An example of an auger is the tool used to dig holes for posts.
See auger in Webster's New World College Dictionary
Origin: by faulty separation of ME a nauger < OE nafogar, nave drill < nafu, nave + gar, a spear: see gore
See auger in American Heritage Dictionary 4
Origin: Middle English
Origin: , from an auger
Origin: , alteration of a nauger
Origin: , from Old English nafogār, auger; see nobh- in Indo-European roots.
Learn more about auger