• (a.) Hypogeous.
Pertaining to the subterranean domain below the endogean, including the dark zone of caves.
Hyp`o·ge'an adjective [ Prefix hypo- + Greek ... earth.] (Botany) Hypogeous. [ Written also hypogæan .]
hypogean A plant that lives primarily beneath the surface of the ground, or that germinates with the cotyledons remaining in the soil; such as the peanut or oak.