Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
Adj. 1. radial-relating to or near the radius; the radial aspect of the forearm. 2. radial-relating to or moving along or having the direction of a radius; radial velocity. 3. radial-issuing in rays from a common center; relating to rays of light; radial heat. 4.