hypogaeic

from The Century Dictionary.

• Same as hypogeic.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Pertaining to, or obtained from, the peanut, or earthnut (Arachis hypogæa).
• adjective (Chem.) an acid in the oil of the earthnut, in which it exists as a glyceride, and from which it is extracted as a white, crystalline substance.