GLOSSARY. 



157 



Rheumatic (Gr. pev/j.a, rheuma, 

 watery fluid). Belonging to or 

 having rheumatism. 



Elieu'matism (Gr. pev/u-a, rheu'ma, 

 watery fluid). A painful disease 

 affecting the muscles and joints. 



Rhipip'tera (Gr. pity, rhips, a mat- 

 work or fan ; Trrepoz/, pter'on, a 

 wing). An order of insects having 

 only two wings, folded longitudi- 

 nally like a fan. 



Rhinenceph'alic (Gr. piv, rkin, the 

 nose ; fjKf(pa\oi/, enkeph'alon, the 

 brain). Belonging to the nose and 

 brain : applied to the prolongation 

 of brain-substance which forms the 

 so-called olfactory nerves. 



RM'zanths (Gr. pia, rhi'za, a root ; 

 avdos, anthos, a flower). A class 

 of plants occupying a position be- 

 tween the flowering and the noii- 

 flowering species. 



Rhi'zogen (Gr. pi&, rhi'za, a root ; 

 ytvva<a, yenna'd, 1 produce). Pro- 

 ducing roots. 



Rhisocar'pous (Gr. pifr, rhi'za, a root; 

 Kapiros, kar'pos, fruit). In botany, 

 applied to plants whose root lasts 

 many years, but whose stem pe- 

 rishes annually. 



Rhizome (Gr. pi^a, rhi'zoma, a 

 root). In botany, a thick stem 

 running along and partly under the 

 ground, sending forth shoots above 

 and roots below. 



Rhi'zopods (Gr. pifa, rhi'za, a root ; 

 irovs,pous< afoot). A class of simple 

 organic beings, consisting of minute 

 gelatinous masses, generally covered 

 by a shell, and often provided with 

 long, slender, contractile filaments. 



RMzotaxls (Gr. fafa rhi'za, a root ; 

 raa-au, t asso, I arrange) . The ar- 

 rangement of roots. 



Rhomb (Gr. po^u/Scu, rhom'bo, I whirl 

 round). A four-sided figure, with 

 the sides equal, and the opposite 

 sides parallel, but with unequal 

 angles. 



Rlionibigan'oid (Gr. poppas, rhom'bos, 

 a rhomb ; yavos, yan'os, splendour ; 

 et'Soy, ei'dos, shape). Having ga- 

 noid or shining scales of a lozenge 

 shape. 



Rhombohed'ral (Gr. po^os, rhom'bos, 



a rhomb ; eSpa, hed'ra, a base). 

 Of the nature of a rhornbohedron. 



Rhombohed'ron(Gr. po^os, rhom'bos, 

 a rhomb ; eSpa, hed'ra, a base). 

 A solid figure, bounded by six 

 planes in the form of rhombs. 



Rhom'boid (Gr. po^os, rhom'bos, a 

 rhomb ; etSos, ei'dos, form). A 

 four-sided figure, having neither 

 equal sides nor equal angles. 



Rlion'chus (Gr. poyx 05 * rhon'chos). A 

 rattling or wheezing sound ; in 

 medicine, applied to any unnatural 

 sound produced in the air-pat sages, 

 by obstructions to the passage of 

 the breath. 



Rliyn'cholites (Gr. pvyxos, rhun'chos, 

 a beak ; Ai0os, littios, a stone). 

 Fossil remains of the beaks of cer- 

 tain cephalopods. 



Rhythm (Gr. pu0/xoy, rhuth'mos, 

 measured motion, proportion). The 

 agreement of measure and time in 

 poetry, prose, music, and motion. 



Rhytk'mical (Gr. pv6/j.os, rhuth'mos, 

 measured motion, proportion). Hav- 

 ing one sound proportioned to 

 another ; regulated by cadences, 

 accents, and quantities. 



Rhythmom'eter (Gr. j)v6/j.os, rhuth'- 

 mos, measured motion ; fj-erpov, 

 met'ron, a measure). An instru- 

 ment for marking time to move- 

 ments in music. 



Rickets (Gr. pax**, rhach'is, the 

 spine). A diseased state of the 

 bones in infancy and childhood, 

 consisting in a deficiency of earthy 

 and other essential matters, and 

 leading to distortion. 



Rigid (Lat. rig'idus, stiff). Stiff; 

 applied to bodies which have be- 

 come so from a naturally flexible 

 state. 



Rigidity (Lat. riyidus, stiff). Stiff- 

 ness arising in bodies that are natu- 

 rally flexible. 



Rin'gent (Lat. rin'go, I grin). In 

 botany, applied to forms of labiate 

 corolla, where the upper lip is much 

 arched, and the lips are separated 

 by a distinct gap. 



Ring-Mountains. In astronomy, cir- 

 cular formations on the surface of 

 the moon, of the same nature as 



