n. An umbelliferous plant the juice of which was used by the ancient Greeks as a food and medicine: called in Latin laserpitium. (See laser, laserpitium.) It has been variously identified, as with Thapsia Garganica.n. [NL. (Linnæus, 1752).] A genus of composite plants, of the tribe Helianthoideæ and subtribe Melampodieæ.