arranged like radii or rays.
having spokes, bars, lines, etc., arranged like radii, as a machine.
made in the direction of a radius; going from the center outward or from the circumference inward along a radius: a radial cut.
Zoology. pertaining to structures that radiate from a central point, as the arms of a starfish.
of, like, or pertaining to a radius or a ray.
having pistons moving inward and outward from a central point or shaft: a radial engine; a radial pump.
noting a bearing designed primarily to take thrusts radial to the center of rotation.
Anatomy, Entomology. of, pertaining to, or situated near the radius.
acting along or in the direction of the radius of a circle: radial motion; radial velocity.
a radial section or construction.
Automotive. radial tire.

1560–70; < Medieval Latin radiālis, equivalent to Latin radi(us) beam, ray (see radius) + -ālis -al1

radiality, noun
radially, adverb
multiradial, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
radial (ˈreɪdɪəl)
1.  (of lines, bars, beams of light, etc) emanating from a common central point; arranged like the radii of a circle
2.  of, like, or relating to a radius or ray
3.  spreading out or developing uniformly on all sides
4.  of or relating to the arms of a starfish or similar radiating structures
5.  anatomy of or relating to the radius or forearm
6.  astronomy Compare tangential (of velocity) in a direction along the line of sight of a celestial object and measured by means of the red shift (or blue shift) of the spectral lines of the object
7.  a radial part or section
8.  zoology
 a.  any of the basal fin rays of most bony fishes
 b.  a radial or radiating structure, such as any of the ossicles supporting the oral disc of a sea star
9.  radial tyre short for radial drilling machine
[C16: from Medieval Latin radiālis from radius]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570, from M.L. radialis, from L. radius "beam of light" (see radius). As a type of tire, attested from 1965, short for radial-ply (tire).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

radial ra·di·al (rā'dē-əl)

  1. Of, relating to, or near the radius or forearm.

  2. Moving or directed along a radius.

  3. Radiating from or converging to a common center.

ra'di·al·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Rings represent kingdoms, radial wedges represent centuries, and the names of
  kingdoms are printed on the moveable arm.
He then examined the patient's other arm, quickly palpating the radial artery
  as if to confirm his findings.
Safety and reliability improvements include radial tires and custom a alignment
  that allows proper tracking with the newer tires.
The resulting surface slick will spread into a thin film due to the radial
  outflow of entrained water near the surface.
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