belowground

adverb or adjective
be·​low·​ground | \bi-ˌlō-ˈgrau̇nd, bi-ˈlō-ˌgrau̇nd\

Definition of belowground 

: beneath the surface of the earth

Synonyms & Antonyms for belowground

Synonyms

subsurface, subterranean, underground

Antonyms

aboveground, surface

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First Known Use of belowground

1617, in the meaning defined above

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Time Traveler for belowground

The first known use of belowground was in 1617

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