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GLOSSARY. 



in botany, applied to hair-like pro- 

 jections on young roots, and to leaves 

 arising from the root ; radical sign 

 in algebra, the sign A/ with a num- 

 ber prefixed thus, -\/, placed before 

 any quantity to show what root is 

 to be extracted. 



Ead'icle (Lat. radic'ula, a little root). 

 The part of the embryo in plants 

 which becomes the root ; the end 

 of roots, absorbing nutriment. 



Ea'diolites (Lat. ra'dius, a ray ; Gr. 

 \i9os, Uth'os, a stone). In geology, 

 a genus of bivalves in the chalk- 

 formation, having a radiated struc- 

 ture of the outer layer of the upper 

 valve. 



Eadiom'eter (Lat. ra'dius, a ray : Gr. 

 /j.Tpov, met'ron, a measure). An 

 instrument formerly used for taking 

 the altitude of celestial bodies. 



Ka'dius (Lat. a ray). In geometry, 

 a straight line drawn from the 

 centre to the circumference of a 

 circle ; in anatomy, the outer bone 

 of the forearm, reaching from the 

 elbow to the wrist above the thumb. 



Ea'dius Vector (Lat. a carrying ra- 

 dius). A straight line drawn to 

 any body moving in a curvilinear 

 path, from a fixed point considered 

 as the centre of the motion. 



Radix (Lat. a root). In etymology, a 

 primitive word from which other 

 words spring ; in arithmetic, a 

 number which is arbitrarily made 

 the base of any system of computa- 

 tion. 



Bain-gauge. An instrument for mea- 

 suring the quantity of rain which 

 falls at any place. 



Ea'mal (Lat. ra'mus, a branch). 

 Belonging to branches. 



Eamen'ta (Lat. ramen'tum, a little 

 scraping). Scrapings ; in botany, 

 applied to thin brown leafy scales 

 found on young shoots and other 

 parts. 



Eam'ification (Lat. ra'mus, a branch ; 

 fadin, I make). A branching : the 

 manner in which a tree produces its 

 branches. 



Eam'ify (Lat. ra'mus, a branch ;fadio, 

 I make). To make branches, or 

 shoot into branches. 



Bamollis'sement (French, from the 

 Latin mollis, soft). Softening ; a 

 diseased condition occurring in va- 

 rious parts of the body, in which 

 they become softer than is natural. 



Ba'mous (Lat. ra'mus, a branch). 

 Having or belonging to branches. 



Ra'mus (Lat. a branch). In anatomy, 

 applied to branches of arteries or 

 other organs. 



Eani'dae (Lat. ra'na, a frog). The 

 family of batrachian reptiles, having 

 as its type the frog. 



Ea'nine (Lat. ra'na, a frog, or a 

 swelling of the tongue). Belonging 

 to a frog ; in anatomy, applied to 

 an artery of the tongue. 



Ea'nula ^Lat. a little frog). A kind 

 of swelling under the tongue. 



Ea'phe' (Gr. fatyr], rhaphe, a seam). 

 A term applied to parts which look 

 as if they had been sewn together. 



Eaph'ides (Gr. faQis, rhaph'is, a 

 needle). Minute crystals, like 

 needles, lying in the tissues of 

 plants. 



Eapto'res (Lat. rap'io, I snatch). An 

 order of birdd characterised by 

 the strength of their claws and bill, 

 and the general strength of their 

 bodies : the birds of prey ; as the 

 eagle, vulture, hawk, &c. 



Earefac'tion(Lat. rams, rare or thin; 

 fac'io, I make). A making thin ; 

 an increase of the intervals between 

 the particles of matter, so that the 

 same amount is made to occupy a 

 larger space ; applied especially to 

 airs and gases ; also the state of 

 the lessened density. 



Ea'refy (Lat. rarus, thin ; fac'io, I 

 make). To make or become thin. 



Easo'res (Lat. rado, I scratch). The 

 order of birds, including pigeons 

 and gallinaceous birds, which seek 

 their food by scratching the ground. 



Ratchet. A piece of mechanism, one 

 end of which abuts against a tooth 

 of a wheel called a ratchet-wheel. 



Eatch.et-wh.eel. A wheel with 

 pointed teeth, on which a ratchet 

 abuts. 



Ea'tio (Lat. reor, I think or suppose). 

 The relation of two quantities ol 

 the same kind to one another ; the 



