earthnut

[ urth-nuht ]
/ ˈɜrθˌnʌt /

noun

any of various roots, tubers, or underground growths, as the peanut and the truffle.
any of the plants producing these.

Origin of earthnut

before 900; Middle English erthenote, Old English eorthnutu. See earth, nut

British Dictionary definitions for earthnut

earthnut
/ (ˈɜːθˌnʌt) /

noun

Also called: pignut a perennial umbelliferous plant, Conopodium majus, of Europe and Asia, having edible dark brown tubers
any of various plants having an edible root, tuber, underground pod, or similar part, such as the peanut or truffle