RUBERYTHRINIC
Ru`ber*y*thrin"ic, a. Etym: [L. ruber red + erythrin.] (Chem.)
Defn: Pertaining to, or designating, an acid extracted from madder root. It is a yellow crystalline substance from which alizarin is obtained.
RUBESCENCE
Ru*bes"cence, n.
Defn: The quality or state of being rubescent; a reddening; a flush.
RUBESCENT
Ru*bes"cent, a. Etym: [L. rubescens, -entis, p.pr. of rubescere to
grow red, v. incho from rubere to be red: cf. F. rubescent. See
Ruby.]
Defn: Growing or becoming red; tending to redness.
RUBIACEOUS
Ru`bi*a"ceous, a. Etym: [L. rubia madder, fr. rubeus red.] (Bot.)
Defn: Of or pertaining to a very large natural order of plants (Rubiaceæ) named after the madder (Rubia tinctoria), and including about three hundred and seventy genera and over four thousand species. Among them are the coffee tree, the trees yielding peruvian bark and quinine, the madder, the quaker ladies, and the trees bearing the edible fruits called genipap and Sierre Leone peach, besides many plants noted for the beauty or the fragrance of their blossoms.
RUBIACIN
Ru"bi*a*cin, n. Etym: [L. rubia madder, fr. rubeus red.] (Chem)
Defn: A substance found in madder root, and probably identical with ruberythrinic acid.