BHEOTOME 



287 



RHUMB 



to the passage through it of a galvanic cur- 

 rent. 



Rheotome, (rC'o-tom). [Gk. rheos, current; 

 tome, cutting.] v. Break. 



Rhesus monkey, (rf/sus)=Macacus rhesus. 



Rheum, (re'um). [Rheon, the Greek name.] 

 Rhubarb: a plant belonging to Polygonacejo. 



Rhinaisthetics, (ri-niL-sthet'iks). [Gk. rhin, 

 nose; aisthetis, perception.] Odour sensations. 



Rhinanthus, (ri-nan'thus). [Gk. rhin, nose; 

 anthos, flower.] Yellow-rattle: a plant be- 

 longing to Scrophulariacese. 



Rhine loess. Beda belonging to Post-Pliocene 

 rocks. 



Rhinencephalic, (rl-nen-se-fal'ik). [Gk. rhin, 

 nose; enkephalon, brain.] =Nasal: belonging 

 to the front of the cranium. 



Rhinoceros, (ri-nos'e-ros). [Rhinokeros, the 

 Greek name.] A f'-*^- 



large quadruped be- ^&&+ . 

 longing to Pachy- 

 dermata; found in 

 S. Africa and India 

 only; fossil remains 

 found in Pliocene 

 and Pleistocene 

 rocks. R. bird = 

 Buceros rhinoceros: 

 found in India. Rhinoceros. 



Rhinocryptis, (ri-nd-krip ' tis). [Gk. rhin, 

 nose; cryptos, hidden.]=Mud-fish, q.v. 



Rhinolophus, (ri-nol'o-fus). [Gk. rhin, nose; 

 lophos, crest .]= Vampire bat: a variety of 

 the bat, q.v. 



Rhizanths, (riz'anths). [Gk. rhiza, root; an- 

 thos, flower.] = Rhizogens: root parasites; 

 plants which have no foliage leaves, appa- 

 rently intermediate between flowering and 

 flowerless plants. 



Rhizobolaceae, (riz-o-bol-ase-e). [Gk. rhiza, 

 root ; bole, casting.]=Rhizobols: large trees, 

 with leathery palmate leaves and large 

 flowers, belonging to Guttiferales. 



Rhizocarpeae, (riz-o-kar'pe-e). [Gk. rhiza, root; 

 karpos, fruit.]=:Marsileaceaj, q.v. Vascular 

 cryptogamic plants, which branch like 

 ferns. 



Rhizocephala, (riz-o-sef a-la). [Gk. rhiza, root; 

 kephale, head.] Crustacean parasitic ani- 

 mals, which bury their heads in the bodies 

 on which they live. A division of Pecto- 

 straca; locomotive when young. 



Rhizodont, (riz ' o-dont). [Gk. rhiza, root; 

 odous, tooth.] Teeth with branching fangs, 

 which anchylose with the jaw. 



Rhizogens, (riz'6-jenz). [Gk. rhiza, root; 

 yennao, I produce.] Parasitic plants, with 

 scales for leaves, forming a primary division 

 of flowering plants. 



Rhizoids, (riz'oidz). [Gk. rhiza, root; eidos, 

 form.] Root-like appendages. 



Rhizome, (riz'om). [Gk. rhizoma, rooting.] A 

 prostrate stem, which throws out fresh root- 

 lets. 



Rhizomorpha, r (riz-o-mor'fa). [Gk. rhiza, root; 

 morphe, shape.] A fungus, sometimes phos- 

 phorescent; named from resemblance to a 

 root. 

 Rhizophaga, (riz-ofa-ga). [Gk. rhiza, root; 



phaga, I eat.] A division of Marsupialia, 

 represented by the wombat. 



Rhizophoracese, (riz-of-6-ra'se-C). [Gk. rhizn, 

 root; phoreo, I bear.]=Mangroves: tropi- 

 cal littoral shrubs and trees, with polypetal- 

 ous flowers, the seeds of which germinate 

 before falling, belonging to Myrtales. 



Rhizopoda, (riz-op'o-da). [Gk. rhiza, root; 

 pous, foot.] Simple gelatinous bodies, mostly 

 microscopic, forming a division of Protozoa, 

 which can extend at will any portions of the 

 body as pseudopodia, which resemble roots 

 in appearance. " Life without organization:" 

 a class of Infusoria, as arranged by Hceven 

 and by Ehrenberg. 



Rhizostoma, (riz-os'to-ma). [Gk. rhiza, root; 

 stoma, mouth. ] A genus of Acalephee, 

 q.v. 



Rhodi, (ro'di). [Rhodium, q.v.] A prefix im- 

 plying the presence of rhodium. 



Rhodium, (ro'di-um). [Gk. rhodon, rose.]= 

 Rh : one of the noble metals; a very hard, 

 white, almost infusible metal, usually found 

 with platinum. 



Rhododendron, (ro-do-den'dron). [Gk.rJiodon, 

 rose; dendron, tree.] An evergreen shrub, 

 belonging to Ericaceae, having handsome 

 flowers. 



Rhodomenia, (ro-do-me'ni-a). [Gk. rhodon, 

 rose.] An edible sea-weed. 



Rhodonite, (r5'don-it). [Gk. rhodon, rose.] A 

 metallic mineral, with oblique crystalliza- 

 tion, chiefly silicate of manganese; belongs 

 to the manganese group. 



Rhodospermese, (ro-dos-sper'me-e). [Gk. 

 rhodon, rose; sperma, seed.] A sub-division 



dymeniaceae, (ro-di-men-i-a'se-e). 



forming a sub-division of Rhodospermeje. It. 



palmata=DnlRe. 

 Rhomb, (romb or rom). [Rhombus, the Latin 



word. ] A figure formed by four 



equal straight .lines, the angles 



of which are not right angles, 



as in the diamond. Fresnel's 



R., v. Fresnel. R. spar=A. 



mineral, chiefly carbonate of 



calcium. Rhomb. 



Rhombohedral system, (rom-bo-he'dral). R. 



system of crystallization: in which the axes 



make equal angles and the parameters are 



equal. 

 Rhombohedron, (rom-bo-he'dron). [Rhomb, 



q.v. ; Gk. hedra, seat.] A solid figure bounded 



by six equal rhombs. 

 Rhomboid, (rom'boid). [Rhomb, q.v. ; Gk. 



eidos, form.] A four-sided 



figure in which none of the 



angles are right angles, and 



the opposite sides only are 



equal. Rhomboid. 



Rhombus, (rom'bus). [The Latin name. ] A 



fish belonging to Pleuronectidse. R. maxi- 



mus= Bannock fleuk=Turbot. 

 Rhubarb, fro-barb). [Rhubarbe, the French 



name.]=Rheum: a plant belonging to Poly- 



gonaceae. Monk's .R.=Rumex Alpinus. 

 Rhumb, (rum). A point of the compass. 7?. 



line : a line drawn towards a given point of 



