Anatomy
radius Audio
ra·di·us [ rey-dee-uhs ]
Subclass of:
Arm Bones
Etymology:
Latin radius = spoke of a wheel
Definitions related to bone structure of radius:
  • (radius) The long bone that lies between the radiohumeral joint and the carpus and is adjacent to the ulna.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • (radius) Long bone, each instance of which articulates with some humerus, ulna, lunate and scaphoid.
    Foundational Model of Anatomy
    University of Washington, 2017
  • (radius) The outer shorter of the two bones of the FOREARM, lying parallel to the ULNA and partially revolving around it.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • (radius bone) The long bone of the forearm that extends from the lateral aspect of the elbow to the thumb-side of the wrist.
    NCI
    U.S. National Cancer Institute, 2021
  • Radius, in anatomy, the outer of the two bones of the forearm when viewed with the palm facing forward. All land vertebrates have this bone. In humans it is shorter than the other bone of the forearm, the ulna. The head of the radius is disk-shaped; its upper concave surface articulates with the...
    Encyclopedia Britannica
    Encyclopedia Britannica, Inc., 2025
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