Skip to Content
Medical Term:

ray

Pronunciation: ra

Definition:

  1. A beam of light, heat, or other form of radiation. The rays from radium and other radioactive substances are produced by a spontaneous disintegration of the atom; they are electrically charged particles or electromagnetic waves of extremely short wavelength.
  2. A part or branch that extends radially from a structure.

[L. radius]

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
Hide