

RADICAL 



1233 



RADIX 



hemispheres (Spitzka). R. -theory of Rauber, a 

 theory to explain the origin of double monsters. " It 

 -ed upon the fact that in the earliest stage the 

 embryonic trace extends from the edge of the germinal 

 wall or ridge toward the area pellucida as a radius. 

 When a plural formation occurs, Rauber assumes that 

 two, or even three, of these embryonic traces appear 

 instead of one, the development being designated as 

 • pluri- radial." " 



adical (rad'-ik-al) [radix, a. root]. Designed to 



y disease instead of modifying it. The opposite 



jf palliative. The opposite of conservative. In 



jiology, belonging to the root. Radical leaves are 



hose which, like the leaves of the dandelion, appear 



spring from the root, but which in reality arise from 

 i very short stem at or near the surface of the ground. 

 idicant \rad'-ik-ant) [radicari, to take root]. In 

 biology, rooting ; applied to roots proceeding from 

 ome part of the ascending axis, as for climbing, like 



toxicodendron. 

 dicate (rad'-ik-af) [radicari ', to take root]. In 

 )iology, rooted or adherent, as by a byssus. 

 dicel i >J'-is-el)[radice!la, a little root]. In biology, 

 tiny root ; the rootlet produced in germination, 

 dicicolous (rad-is-ik'-o-lus) [radix, root ; colere, to 

 nhabit]. In biology, living upon or devouring roots. 

 ] diciflorous (ra-dis-if-lo' -rus) [radix, root; Jlos, 

 ower]. In biology, having the appearance of flow- 

 ring from the root. 

 '. diciform (ra-dis' -if-orm) [radix, root; forma, 

 >rxa]. In biology, having the form and function of a 

 i x>t. 



I dicle (rad'-ik-l) [dim. of radix]. I. A rootlet, 



be germ of a root. 2. The primary root or stem of 



he embryo. 3. The initial fibril of a nerve ; the begin- 



ling of a vein. 4. A group of atoms having unsatis- 



ied valency ; an unsaturated molecule which goes 



nto and out of combinations without change, and 



>hich determines the character of the compound. 



i., Acid. See Acid. R., Alcohol, a radicle which, 



hen it substitutes half the hydrogen in one or more 



iolecules of water, forms an alcohol. R., Aldehyd, 



radicle which, when it replaces two atoms of hydro- 



:n in an alcohol, forms an aldehyd. R., Ascending, 



f the Fornix), the anterior crura or fibers, extending 



jward from the corpora albicantia. R., Descending, 



fthe Fornix), the posterior crura or those fibers of 



j e fornix extending from the optic thalami to the 



1 >rpora albicantia. R., Electro-negative, the non- 

 etallic constituent of a compound which, in electro- 



volved at the anode. R., Electro-positive, 



at constituent of a salt which, in electrolysis, ap- 



■ars at the kathode, and which is either a base or a 



. oup of atoms having basic properties. 



R licose (rad'-ik-oz) [radix, root]. In biology, hav- 



g large or numerous roots. 

 R,iicula, Radicule (rad-ik' -u-lah, rad'-ik-ul) [radic- 



1, little root]. Same as Radicle. 

 R'icular (rad-ik' ' -u-lar) [radicu/aris, radix, a root]. 

 1 ;rtaining to the roots of nerves. R. Arteries, arter- 

 ; accompanying nerve-roots into the spinal cord. R. 

 asciculus. Internal, of Charcot, runs a longi- 

 linal course in the posteroexternal column and then 

 ters the gray substance of the posterior cornu. R. 

 bers, External, of Charcot, fibers of the posterior 

 spinal nerves passing through the substantia 

 latinosa of Rolando to the posterior cornu. 

 R icule (rad'-ik-til). See Radicle. 

 R iculose (rad-ik' -u-loz) [radicula, a rootlet]. In 



>logy, having rootlets, 

 rt len 'ra' -de-en) [radius, a spoke]. Belonging to 

 ! radius in itself. 

 78 



Radiism (ra'-de-izm) [radius, a ray]. Same as Radia- 

 tion. 



Radio- (ra' -de-o-\[radius , a spoke]. A prefix denoting 

 connection with the radius. 



Radio-bicipital (ra'-de-o-bi-sip'-it-al) [radius, a spoke ; 

 biceps, two-headed]. Relating to the radius and the 

 biceps. 



Radio-carpal (ra' -de-o-kar' -pal) [radius, a spoke; 

 Kap~6g, carpus]. Relating to the radius and the 

 carpus. R.- Amputation, removal of the hand at the 

 wrist-joint. 



Radio-digital (ra -de- o- dif - it-al) [radius, a spoke ; 

 digitus, a digit]. Relating to the radius and the 

 fingers. 



Radio-humeral (ra' -de-o-hu' -mer-al) [radius, a spoke ; 

 humerus, the humerus]. Relating to the radius and 

 the humerus. 



Radiolus (ra-di'-o-lus) [dim. of radius, a ray: //., 

 Radioli]. In biology, one of the secondary rays of 

 the main rachis of a feather. In surgery, a probe or 

 sound. 



Radio-metacarpalis (ra'-de-o-met-ak-ar-pa' -lis) [ra- 

 dius, spoke; metacarpus]. The flexor carpi radialis 

 brevis when the insertion is at a metacarpal bone. 



Radiometer (ra - de - om' - et - er) [radius, ray ; fierpov, 

 measure]. An instrument for transforming radiant 

 energy into mechanical work. 



Radiometric (ra-de-o-met'-rik) [radius, ray ; fierpov, 

 measure] . Pertaining to the radiometer. 



Radio-muscular (ra-de-o-mus' -ku-lar) [radius, radius ; 

 musculus, a muscle]. Relating to the radius and its 

 muscles. The name of branches of the radial artery 

 distributed to the muscles of the forearm, and of fila- 

 ments of the radial nerve going to the same muscles. 



Radio-palmar (ra' - de-o -pal' - mar) [radius, radius ; 

 palma, palm]. Relating to the radius and the palm. 



Radio-ulnar (ra'-de-o-ul'-nar) [radius, spoke ; ulna, 

 ulna]. Pertaining to the radius and the ulna. 



Radius (ra'-de-us) [radius, a staff, rod, spoke of a 

 wheel, ray : //., Radii]. In biology : (a) spokebone, 

 the outer of the two bones of the antibrachium or an- 

 terior limb of a vertebrate ; see A/uscles, Table of; 

 (b) one of the veins of an insect's wing ; (c) a ray of 

 the first order, of the shaft of a feather (used in the 

 plural) ; (d) one of the radiating threads of a spider's 

 web ; (e) a bifurcated piece, of which there are 

 five, in the oral skeleton of an echinoderm. I. In 

 geometry, the line drawn from the center of a circle 

 to its circumference. 2. One of the cartilaginous rods 

 supporting the fins in fishes. 3. See Ray. Radii 

 auriculares, lines projected on the cranium at right 

 angles to a line passing through the auricular points. 

 R. ciliares, the ciliary processes. R. fixus, in crani- 

 ometry, a line connecting the inion and the hormion. 

 R. frontis, wrinkles of the forehead. R. lentis. 

 lines radiating from the poles of the crystalline lens. 

 R. medullares, bundles of receiving tubules of the 

 kidney, beginning in one tubule at the apices of the 

 papillae, dividing dichotomously, and extending nearly 

 to the cortical surface. 



Radix (ra'-dix) [gen., radicis : pi., radices]. The 

 root or lower extremity of a plant, constituting its organ 

 of prehension, and also, to a great extent, of nutrition. 

 Applied also to root-like organs <5r parts of the body. 

 The five greater aperient roots: smallache, parsley, 

 fennel, asparagus, and butchers' broom. The five 

 lesser aperient roots: dandelion, caper, restharrow, 

 madder, and eryngo. Radices accessoriae breves 

 ganglii ciliaris, nerve-branches occasionally seen unit- 

 ing the ciliary ganglion with the oculomotor and other 

 nerves. Radices accessoriae mediae ganglii ciliaris, 

 inconstant nerve-branches which connect the ciliary 



