earthnut

From Middle English erthenote, from Old English eorþhnutu, from Proto-Germanic *erþōhnuts. Cognate with German Erdnuss and Icelandic jarðhneta.

• (UK) IPA^(key): /ˈɜː(ɹ)θ.nʌt/
• (US)

earthnut (plural earthnuts)

1. Any of various roots, tubers, or pods that grow underground.
   1. A tuber belonging to the species Conopodium majus (syns. Bunium flexuosum, Conopodium denudatum), Bunium bulbocastanum (syn. Carum bulbocastanum), or Apios americana (syn. Apios tuberosa)

      Synonyms: earth chestnut, hawknut, pignut

   2. The dwarf ginseng: Panax trifolius
   3. Synonym of peanut (Arachis hypogaea)
   4. The underground tuber belonging to the genus Tuber; the truffle.

      Synonym: truffle

• groundnut

• tree nut

• heartnut