[ fō′tə-krō′mĭk ]
A light-sensitive eyeglass lens that automatically darkens in sunlight and clears in reduced light.
Retro Words You’ll Probably Never Use AgainMost of these retronyms -- obsolete words and phrases -- are outdated technologies.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.