A person who gads or gads about; (now especially) one who goes to many social events or travels to many places for pleasure; a gadabout.
Mid 16th century; earliest use found in John Bale (1495–1563), bishop of Ossory, evangelical polemicist, and historian. From gad + -er.
A machine designed to drill a straight line of holes in rock, used in the process of breaking up and removing rock from its bed.
Late 19th century; earliest use found in The Manufacturer and Builder. From gad + -er.