Webster's English Dictionary

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radial

1. ra.di.al \'ra-d-e--*l\ \-e--*-le-\ aj [ML radialis, fr. L radius ray] 1: 
   arranged or having parts arranged like rays  2a: relating to, placed like, 
   or moving along a radius  2b: characterized by divergence from a center  3: 
   of, relating to, or adjacent to a bodily radius  4: developing uniformly 
   around a central axis  - ra.di.al.ly av
2. radial n 1a: a radial part  1b: RAY  2: a body part lying near or 
   following the course of the radius