Entry 1 sense Webster, 1913 melosa · IPA 01 n. A South American herb (Madia sativa) with sticky glandular foliage; it is a source of madia oil. 1. A South American herb (Madia sativa) with sticky glandular foliage; it is a source of madia oil. Syn. Chile tarweed, madia oil plant, Madia sativa.