BABBIT 



282 



RAINBOW 



E. 



Rabbit, (rab'bit). [Robbe, the Dutch name.] 

 A small burrowing animal, resembling the 

 hare, belonging to Rodentia. R. jisii = 

 Chimaera monstrosa. 



Raccoon, v. Racoon. 



Race-horse, A bird. v. Micropterus. 



Racemates, ( ras'e-ruats ). [Racemic, q.v. ] 

 Compounds of racemic acid and bases. 



Raceme, (ra-sCm'). [L. racemus, grape-cluster.] 

 R. inflorescence: in which the flowers are 

 arranged on a common axis, as in the cur- 

 rant!; the corymb and panicle are varieties 

 of the raceme. 



Racemic acid, (ra-sem'ik). [L. racemus, grape- 

 stalk.] = C 4 H 6 O B = Paratartario acid = A 

 modification of tartaric acid, found in grapes. 



Racemifera, (ras-e-mif'e-ra). [Raceme, q.v. ; 

 L. fero, I bear.] Ehreuberg's term for star- 

 fishes, jelly-fishes, &c. 



Racemose, (ras'e-moz). [Raceme, q.v.] Hav- 

 ing the flowers in racemes. R. glands: re- 

 sembling a bunch of grapes. 



Rack, (rak). [A.-S. necan, to extend.] In 

 machinery, aflat bar having teeth along it, so 

 as to move, or be moved by, a toothed wheel. 



Racoon, (ra-koon') [F. raton, small rat.] A 



badger-like animal, 1^^^^=^^^ 



belonging to Carni- 

 vora, found in N. 

 America. 



Radial, (rii/di-al). 

 [Radius, q.v. ] 1. 

 Related to the 

 radius or fore-arm. 

 2. Related to the 

 radius of a circle. 



Radiaria, (rii-di-a'- 

 ri-a). [Radius, q. v.] 

 Milne-Edwards's term for 'Radiata. 



Radiata, ( ra-di-ti'ta ). [Radius, q.v.] Origi 

 nally used by Cuvier 

 for a sub-kingdom, now- 

 broken up; now used 

 generally for any ani- 

 mals having a radiate 

 form. Polyzoa, Ccelen- 

 terata, Annuloida, and 

 Protozoa, have succes- 

 sively been removed 

 from Radiata. and 

 formed into other divisions. "Used by Milne- 

 Edwards as = Zoophytes. 



Radiated, (ra-di-a'ted). [Radius, q.v.] Issu- 

 ing in rays. R. cmijnas=Radiata, q.v. 



Radical= Radicle, q.v. 



Radicle, (rad'i-kl). [L. radix, root] 1.= 

 Young root of a plant. 2. In chemistry, a 

 group of atoms capable of combining with 

 other atoms by substitution. Organic R.= 

 Compound R., q.v. 3. Used generally for root, 

 or commencement, of any organic process. 

 Compound R. = A. group of elements which 

 enters into various combinations without 

 being readily decomposed by the chemical 



Raccooiu 



liadiate. 



changes ; e.g., ethyl, methyl, arnyl, &c. 

 Oxides of compound .fis.=Ethers: hydrated 

 oxides = Alcohols. 



Radiola, (ra-di'o-la). [L. radius, ray.] All- 

 seed: a small herb belonging to Linaceae. 



Radiolaria, ( ra-di-6-la'ri-a ), [L. radiolus, 

 little radius.] Sea-egg, &c.: animals (mostly 

 marine) belonging to Protozoa, consisting of 

 minute masses of sarcode, throwing out 

 pseudopodia, and having sometimes a silici- 

 fied skeleton. 



Radiometer, (ra,-di-om'e-ter). [L. radius, ray; 

 Gk. iiietron, measure.] Light-mill: an appa- 

 ratus, working in a vacuum, intended to 

 show the energy of the sun's rays; also called 

 Crookes's apparatus. 



Radish, (rad'ish). [L. radix, root.]=Raph- 

 anus : a plant belonging to Brassicaceaj. 

 Horse #.=Hyperanthera. 



Radius, (ra'di-us). [L. radius, spoke.] 1. Tho 

 inner bone of the fore- 

 arm, which carries the 

 hand. 2. Any straight line 

 drawn from the centre of 

 a circle to the circum- 

 ference. R. vector: an 

 imaginary line drawn 

 from the sun to a planet. 



Radix, (ra'dix). [The 

 Latin word.] Root. R. K.uliu8. 



swm6u/=Musk-root, q.v. 



Rafflesia, (raf-fle'si-a). [Sir T. S. Raffles.] A 

 plant, the type of Rafflesiaceae, q.v. 



Rafflesiacese, (raf-fle-si-a'se-e). [RafBesia. q.v.] 

 =Patna-worts: stemless plants, parasitic on 

 trees, belonging to Rhizogeus. 



Rag. R. stone: a siliceous stone, used for 

 sharpening. JR. worm= Mudworm=Limi- 

 colae, q.v. R. wort =Senecio Jacobaja. 



Ragged Robin=Lychnis flos-cuculi, q.v. 



Raia, (ra'i-a). [The Latin name.]=Ray: a 

 fish, belonging to Raiidse, q.v. R. beatis= 

 Blue-skate. Electric /?.=Torpedo, q.v. 



Raiidse, (ra'i-de). [Raia, q.v.; Gk. eidos, like.] 

 A family of fishes belonging to Plagiostomi: 

 includes the ray, skate, saw-fish, torpedo, &c. 



Rail, (ral). [Rallus, Q.v.]=Rallus: a bird, 

 the type of Rallidae, q.v., has short beak and 

 wings, and long legs and feet. Land R.= 

 Corn-crake=Crax pratensis. 



Rain, (rfm). [Rene, the A.-S. word.] R. cloud 

 =Nimbus. Fossil R.: small 

 indentations, especially in 

 some New Red Sandstone 

 rocks; supposed to be rain- 

 marks. R. gauge = Ombro- 

 meter: an instrument adapted 

 to the measurement of the 

 quantity of rain. 



Rainbow. An arch, contain- 

 ing the colours of the spec- 

 trum, caused by the refrac- 

 tion of the sun's light in drops 

 of rain ; sometimes called Iris. Rain-guage. 



