Earthnut \Earth"nut`\, n. (Bot.)
A name given to various roots, tubers, or pods grown under or
on the ground; as to:
(a) The esculent tubers of the umbelliferous plants {Bunium
flexuosum} and {Carum Bulbocastanum}.
(b) The peanut. See {Peanut}.
[1913 Webster]