from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or arranged like rays or radii.
  • adj. Radiating from or converging to a common center.
  • adj. Having or characterized by parts so arranged or so radiating.
  • adj. Moving or directed along a radius.
  • adj. Anatomy Of, relating to, or near the radius or forearm.
  • adj. Developing symmetrically about a central point.
  • n. A radial part, such as a ray, spoke, or radius.
  • n. A radial tire.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. arranged like rays that radiate from, or converge to a common centre
  • adj. moving along a radius
  • adj. of, or relating to the radius bone
  • n. a radial tire / radial tyre

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to a radius or ray; consisting of, or like, radii or rays; radiated.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to a ray or a radius (or radii); having the character or appearance of a ray or a radius; grouped or appearing like radii or rays; shooting out as from a center; being or moving in the direction of the radius.
  • Specifically— In anatomy, of or pertaining in any way to the radius (see radius, 2): as, the radial artery, nerve, vein; radial articulations or movements; the radial side or aspect of the arm, wrist, or hand; the radial group of muscles; the radial pronator or supinator.
  • In zoology, rayed, radiate, or radiating; of or pertaining to the rays, arms, or radiating processes of an animal; relating to the radially disposed or actinomeric parts of the Radiata and similar animals. See cut under medisiform.
  • In ichthyology, of or pertaining to the radialia. See radiale .
  • In botany:
  • Belonging to a ray, as of an umbel or of a flower-head in the Compositæ.
  • Developing uniformly on all sides of the axis: opposed to bifacial or dorsiventral.
  • n. A radiating or radial part: a ray.
  • n. The fourth joint, counting from the base, of the pedipalp of a spider.
  • n. In ichthyology, one of the cartilaginous rays supporting the median fins of elasmobranchs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. arranged like rays or radii; radiating from a common center
  • adj. issuing in rays from a common center; relating to rays of light
  • n. pneumatic tire that has radial-ply casing
  • adj. relating to or near the radius
  • adj. relating to or moving along or having the direction of a radius


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Medieval Latin radiālis, from Latin radius, ray.


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