earthnutEnglishOxford Dictionary of Englishearthnut /ˈəːθnʌt / ▸ noun 1 a Eurasian plant of the parsley family, which has an edible roundish tuber and is found in woodland and acid pasture. Also called pignut,, hognut Conopodium majus, family Umbelliferae. ▪ the almond-flavoured tuber of the earthnut. 2 British English another term for peanut