OPTICALLY adv.
By optics or sight; with reference to optics. Optically active, Optically inactive (Chem. Physics), terms used of certain metameric substances which, while identical with each other in other respects, differ in this, viz., that they do or do not produce right-handed or left-handed circular polarization of light. -- Op…
VALERIC a.
ally, designating any one of three metameric acids, of which the typical one (called also inactive valeric acid), C4H9CO2H, is obtained from valerian root and other sources, as a corrosive, mobile, oily liquid, having a strong acid taste, and an odor of old cheese. Active valeric acid, a metameric variety which turns t…