Emily Dickinson Lexicon

EARTH'NUT, n.

1. The popular name of a spherical knob, the size of a cherry, which is black without and white within, and is a part of the root of the Carum Bulbocastanum. DeCand.
2. The seed-vessel and seed of the Atrachis hypogæa, a leguminous plant. It lies upon, or is buried in the earth, where it ripens.