porphyrogen1tus

[ Lat.porphyra =pur ple, and genitus, pa. par. of gig no =to bear, as a child.] A son born "in the purple," that is, after his father's succe ion to the throne. [PORPHYROGENITISM.] por-phy-roid, s. [Eng. porphyr (y); suff. -oid; Fr. & Ger. porphyroide.] Petrol.: A felsitic rock which, from the presence of a micaceous mineral in more or le parallel bands giving it a foliated aspect, appears to be intermediate between the porphyritic felsites and the gnei ic rocks. por-phy-roph-or-a, s. [ Gr.porphyra =a purple dye, and phoros =bearing.] Entom.: A genus of Coccide. Porphyrophora polonica, found in Germany and Poland, where it lives on the roots of a Sclera nth us, yields a red dye which has long been known. por-phy-rox-in, subst. [Gr. porphyros =purple; Eng. ox ( ygen ), and suff. -in ( Chem.).] Chem.: A neutral substance said by Merck to exist in Smyrna opium. ( Watts .) por'-phy-rỹ, s . [Gr. porphyra =purple; Latin porphyrites; Fr. & Ger. porphyre ; Ital. porfido .] Petrol.: A term originally applied to a rock having a purple-colored base, with inclosed individual crystals of a felspar. It is still used by some petrologists as a generic name for all rocks consisting of a felsitic base, with felspar crystals. Rocks of varied mineralogical composition, origin, and of various colors, having however been included under this name, most petrologists use it in its adjectival form only. Thus, any rock in which crystals of felspar are individually developed, irrespective of the mineralogical composition of the whole, is said to be porphyritic. porphyry-schist, s . [PHONOLITE.] porphyry-shell, s. The genus Murex (q. v.), and specially any species yielding a purple dye. porphyry-tuff, s. Petrol.: A tuff consisting of felsitic substance having an earthy to compact texture, inclosing fragments and crystals of quartz, felspar, and mica, with, occasionally, plant remains. *por-pice, s . [PORPOISE.]