RHINHEMATOMA 



454 



RIMA 



pour in]. The injection of liquid into the nasal 



cavities. 

 Rhinhematoma {rin-hem-at-o'-mah) [p/f, nose; hem- 

 atoma]. An effusion of blood into the nasal cartilage. 

 Rhinocanthectomy (ri-no-kan-thek' '-to-me). See Rhi- 



nommectomy. 

 Rhinocheiloplasty (i-i-no-ki-lo-plas' -te) [/w'c, nose ; 



Xel'Aoq, lip; itJisaoctiv, to form]. Plastic surgery of the 



nose and lip. 

 Rhinolite (ri' -no-lit). See Rhinolith (Illus. Diet.). 

 Rhinomiosis [ri-no-tni-o'-sis) [p/f, nose ; fieiuaiQ, a 



lessening]. Operative shortening of the length of the 



nose. 

 Rhinommectomy {ri-nom-ek' -to-me). See Rhinom- 



mectome (Illus. Diet.). 

 Rhinopharyngolith (ri-no-far-ing' '-go-lith) [/iff, nose; 



ipapv}!;, pharynx; Xidog, stone]. A nasopharyngeal 



calculus. 

 Rhinorrhea. (See Illus. Diet.) R., Cerebrospinal, 



the escape of cerebrospinal fluid through the nose. 

 Rhinosalpingitis {ri-no-sal-pin-ji' -tis) [pic, nose ; 



oa/atiyi;, tube]. Simultaneous inflammation of the 



nasal mucosa and the eustachian tube. 

 Rhinosclerin [ri-no-skle'-rin) [p/f, nose; GK/,?/p6g, 



hard]. A preparation from cultures of Bacillus rhino- 



scleromatis ; used in the treatment of rhinoscleroma. 

 Rhipicephalus (ri-pis-ef / -al-us) [ptn'tc, a fan ; xetyaAt/, 



head]. A genus of ticks. R. shipleyi, the brown 



tick of South Africa, the agent of transmission of 



Rhodesian cattle disease. 

 Rhizology (ri-zoi'-o-je) \_'p'tL,a, root; Aoyor, science]. 



The scientific study of roots. 

 Rhizomelic (ri-zo'-mel-ih) [p<s a > root; fieAoc, a limb]. 



Affecting or relating to the roots of members. 

 Rhizoneure {ri' '-zon-ur) \pi[,a, root ; vsvpov, nerve]. 



One of those cells that form nerve-roots. 

 Rhizoneuron (ri-zo-nu' '-ron) [pi^a, roots; vevpov, 



nerve]. A neuron, the nerve processes of which leave 



the spinal cord through the anterior horn ; a motor 



nerve-cell. 

 Rhodallin. See Thiosinamin (Illus. Diet.). 

 Rhodanate i^rcZ-daii-dt). A sulfocyanate. 

 Rhodanid [re' '-dan-id). A salt of sulfocyanic acid. 

 Rhodeose (ro'-de-oz) [p6Sm>, a rose]. 6 H 12 O 5 . A 



methylpentose derived from convolvulin : best obtained 



from methylphenyl hydrazon by means of benzaldehyd. 



It forms colorless, sweet-smelling, anhydrous needles, 



readily soluble in water, with difficulty in alcohol. 

 Rhodesian Cattle Disease. An African disease of 



cattle transmitted by the brown tick, Rhipicephalus 



shipleyi. Syn., African coast fere?-; Rhodesian tick 



fever; Rhodesian red -cater ; Virulent red water. 

 Rhodinol {ro'-din-ol) [porW, a rose]. C )0 H 20 O. An 



olefinic terpene alcohol found with geraniol in oils of 



rose, pelargonium, and geranium ; it boils at II3°-II4° 



C. Syn., Elaioptene of attar of rose. 

 Rhodogenesis (ro-dojen'-es-is) [pc)f?oi>, arose; yevvav, 



to produce]. The regeneration of visual purple which 



has been bleached by light. 

 Rhodophylaxis (ro-do-fil-aks'-is) [potiov, rose ; tpvAa^ic, 



a guarding]. The property possessed by the retinal 



epithelium of producing rhodogenesis. 

 Rhox (roks) [/'«£]. A name given by Nicander and 



other writers to a poisonous tpider, I.atrodectus tride- 



(imguttatus. 



Rhynchoccel {rin'-ko-sll) [pvyx<>C, a snout; Koi/ia, a 

 cavity]. A spacious cavity containing the proboscis in 

 Nemertian worms. It is filled with fluid in which float 

 long narrow cells, the rhynchoccel corpuscles. 



Rhythmophone {rith'-mo Jon) [/'lvHftde, rhythm ; <puvrj, 

 sound]. A form of microphone for studying the heart- 

 beat and pulse-beat. 



Rib. (See Illus. Diet.) R.s, Abdominal, i. The 

 floating ribs. 2. Ossifications of the inscriptiones 

 tendinse. R.s, Asternal, the false ribs. See under 

 Rib (Illus. Diet.). R.s, Cervical, rib-like processes 

 extending ventrally from the cervical vertebras. R.s, 

 Sacral, the separate points of ossification of the lateral 

 parts of the sternum. R.s, Short, those that do not ar- 

 ticulate with the sternum, the false ribs. R.s, Sternal, 

 the true ribs. R.s, Vertebrochondral, the highest 

 three false ribs of man on each side. They are united 

 in front by their costal cartilages. R.s, Zahn's, the 

 whitish transverse markings often formed on the surface 

 of a thrombus by the extremities of the columns of 

 blood platelets and leukocytes. 



Ribbert's Theory of the Origin of Cancer, according 

 to which the connective-tissue cells increase to such an 

 extent that they invade the epithelial layer and nip off 

 epithelial cells or groups of cells, such isolated epithe- 

 lium being capable of producing cancer. 



Ribose (ri'-boz). C 4 H 5 (OH ) i . CHO. A pentose ob- 

 tained by reduction of the lactone of ribonic acid. 



Richardson's Method of Auscultation. The intro- 

 duction into the esophagus of an elastic bougie or tube 

 connected with the ear pieces of a stethoscope. 



Richardsonia {rick-ard-so / -ne-ah) [Louis Claude Marie 

 Richard, French botanist, 1754-1821]. A genus of 

 plants of the order Rubiacecr. R. pilosa, H. B. et K., 

 a species of the American tropics; the root, poayaalba, 

 white or undulated ipecacuanha, Mexican cocoa, is 

 used as a substitute for true ipecac. 



Ricinate (ris'-in-at). A salt of ricinic acid. 



Ricinism {j-is'-in-izm). Poisoning from seeds of 

 Ricintis communis, L. , used as an abortifacient ; it is 

 marked by hemorrhagic gastroenteritis and icterus. 



Ricinoleate (jis-in-o'-le-at). A salt of ricinoleic acid. 



Ricinolein {ris-in-o' -le-in) . C 67 H 104 C) g . Glyceryl ricin- 

 oleate, one of the constituents of castor oil. 



Rickets. (See Illus. Diet.) R., Fatal. See Achon- 

 droplasia and Achondroplasy (Illus. Diet.). 



Rider's Leg. A strain of the adductor muscles of the 

 thigh. 



Ridge. (See Illus. Diet.) R.s, Marginal, the ridges 

 of enamel on the outer edges of the occlusal surface of 

 the bicuspids and molars. R., Oblique, the ridge 

 extending across the occlusal surface of upper molars, 

 from the mesiolingual tubercle to the distalbuccal. R.s, 

 Palatine, the central ridge together with the lateral 

 corrugations of the mucosa of the hard palate; they 

 are especially noticeable in the human fetus. R., 

 Pterygoid. See Crest, Infratemporal. R., Trans- 

 verse, a ridge running across the crown of a superior 

 molar. R., Triangular, the ridge extending from 

 the point of a cusp or tubercle toward the center of the 

 crown of a tooth. R., Villous (of chorion), ridge- 

 like radiating villi occurring on the exterior aspect of 

 the chorion during the formation of placenta diffusa. 



Riga Balsam. See under Balsam. 



Right. (See Illus. Diet.) R.-eyedness, deztrocu* 

 larity, the condition of using the right eye with more 

 expertness and correctness than the left. 



Rigid {rij'-id) [rigidus, stiff]. Stiff, hard. R. Os. 

 See Rigiditv, Anatomic (Illus. Diet.). 



Rigor. (See Illus. Diet.) R., Acid, muscular rigidity 

 produced by an acid. Syn., Acid stiffening. R., 

 Heat, momentary stiffness of muscles produced by 

 warming, in the case of frogs to 40 C.j in mammalia, 

 to 48°-50° C. ; in birds, to 53 C. R., Water, mus- 

 cular rigidity produced by distilled water. 



Rima. (See Illus. Diet.) R. cartilaginosa. See 

 Respiratory Glottis (Illus. Diet.). R. glottidis car- 

 tilagineae, the opening of the respiratory glottis. R. 

 glottidis membranacese, the opening of the vocal 



