genipap and Sierre Leone peach, besides many plants noted for the beauty or the fragrance of their
(Ru"bi*a*cin) n. [L. rubia madder, fr. rubeus red.] (Chem) A substance found in madder
root, and probably identical with ruberythrinic acid.
(Ru"bi*an) n. [L. rubia madder, fr. rubeus red.] (Chem.) One of several color-producing glycosides
found in madder root.
(Ru`bi*an"ic) a. (Chem.) pertaining to, or derived from, rubian; specifically, designating an
acid called also ruberythrinic acid. [Obs.]
(Ru" bi*ble) n. A ribble. [Obs.] Chaucer.
(Ru"bi*can) a. [F.] Colored a prevailing red, bay, or black, with flecks of white or gray especially
on the flanks; said of horses. Smart.
(Ru"bi*celle) n. [Cf. F. rubacelle, rubicelle, fr. L. rubeus red, reddish.] (Min.) A variety of
ruby of a yellowish red color, from Brazil.
(Ru"bi*con) n. (Anc. geog.) A small river which separated Italy from Cisalpine Gaul, the province
alloted to Julius Cæsar.
By leading an army across this river, contrary to the prohibition of the civil government at Rome, Cæsar
precipitated the civil war which resulted in the death of Pompey and the overthrow of the senate; hence,
the phrase to pass or cross the Rubicon signifies to take the decisive step by which one is committed
to a hazardous enterprise from which there is no retreat.
(Ru"bi*cund) a. [L. rubicundus, fr. rubere to be red, akin to ruber red. See Red.] Inclining
to redness; ruddy; red. "His rubicund face." Longfellow.
(Ru`bi*cun"di*ty) n. [LL. rubicunditas.] The quality or state of being rubicund; ruddiness.
To parade your rubicundity and gray hairs.Walpole.
(Ru*bid"ic) a. (Chem.) Of or pertaining to rubidium; containing rubidium.
(Ru"bi*dine) n. (Chem.) A nitrogenous base homologous with pyridine, obtained from coal
tar as an oily liquid, C11H17N; also, any one of the group od metameric compounds of which rubidine is
(Ru*bid"i*um) n. [NL., fr. L. rubidus red, fr. rubere to be red. So called from two dark
red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia.
See Rubicund.] (Chem.) A rare metallic element. It occurs quite widely, but in small quantities, and
always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its
properties. Symbol Rb. Atomic weight, 85.2.
(Ru*bif"ic) a. [L. ruber red + facere to make.] Making red; as, rubific rays. Grew.
(Ru`bi*fi*ca"tion) n. [Cf. F. rubification.] The act of making red. Howell.
(Ru"bi*form) a. [L. ruber red + -form.] Having the nature or quality of red; as, the rubiform
rays of the sun. [R.] Sir I. newton.
(Ru"bi*fy) v. t. [Cf. F. rubéfier. See Rubific.] To redden. [R.] "Waters rubifying." Chaucer.