MOLYB'DEN MOLYB'DENA, noun [Gr. a mass of lead.] An ore of molybdenum, a scarce mineral of a peculiar form, and sometimes confounded with plumbago, from which however it is distinguished by its more shining, scaly appearance, and a more greasy feel.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI