From The Collaborative International Dictionary of English v.0.48:
Madia \Ma"di*a\, n. [NL., fr. Sp. madi, fr. Chilian madi, the
native name.] (Bot.)
A genus of composite plants, of which one species (Madia
sativa) is cultivated for the oil yielded from its seeds by
pressure. This oil is sometimes used instead of olive oil for
the table.
Syn: melosa, Chile tarweed, madia oil plant, Madia sativa.
[1913 Webster]