adaptation

ad*ap*ta*tion

noun

{bc}something that is {d_link|adapted|adapt}

dark adaptation

noun

{bc}the process including dilation of the pupil, increase in sensitivity of the retinal rods, and regeneration of rhodopsin by which the eye adapts to conditions of reduced illumination

light adaptation

noun

{bc}the process including contraction of the pupil and decrease in rhodopsin by which the eye adapts to conditions of increased illumination

coun*ter*ad*ap*ta*tion

noun

{bc}{d_link|adaptation|adaptation} of an organism (as in modification of behavior, physiology, or form) in response to an adaptation of another organism with which it regularly interacts