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.
Definition of 'arch'. arch (ÉËÊ³tÊ ) An arch is a structure that is curved at the top and is supported on either side by a pillar, post, or wall. An arch is a curved line or movement. The arch of your foot is the curved section at the bottom in the middle.