OVERGROUND

Proper noun

Overground

(rail) The London Overground, a counterpart of London Underground operated by TfL (Transport for London), which operates some of the various lines around London which are mainly above ground.

Etymology

Adjective

overground (not comparable)

above the ground

Synonyms: aboveground, superterranean

Antonym: underground

Source: Wiktionary

O"ver*ground", a.

Definition: Situated over or above ground; as, the overground portion of a plant.

Source: Webster’s Unabridged Dictionary 1913 Edition