groundnut n. + Add to list US //ˈɡɹaʊndˌnət// UK //ɡɹˈaʊndnʌt// ground·nut SynonymsEtymology Synonyms earthnutgooberpeanutOrigin From ground + nut. Compare Icelandic jarðhneta, German Erdnuss (both cognate with earthnut) and Hungarian földimogyoró.