Webster's English Dictionary

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radicle

rad.i.cle \'rad-i-k*l\ \ra-'dik-y*-l*r\ n [L radicula, dim. of radic-, 
   radix] 1: the lower part of the axis of a plant embryo or seedling :  1a: 
   the root portion  1b: HYPOCOTYL  1c: the hypocotyl and the root together  
   2: the rootlike beginning of an anatomical vessel or part  3: RADICAL  - 
   ra.dic.u.lar aj