What does "jupiter" mean?

Jupiter: (Astron.) One of the planets, being the brightest except Venus, and the largest of them all, its mean diameter being about 85,000 miles. It revolves about the sun in 4,332.6 days, at a mean distance of 5.2028 from the sun, the earth's mean distance being taken as unity. Jupiter's beard. (Bot.) (a) A South European herb, with cymes of small red blossoms (Centranthus ruber). (b) The houseleek (Sempervivum tectorum); -- so called from its massive inflorescence, like the sculptured beard of Jove. Prior. (c) the cloverlike Anthyllis Barba-Jovis. -- Jupiter's staff (Bot.), the common mullein; -- so called from its long, rigid spike of yellow blossoms.