from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The phenomenon, in chemistry, physics and mathematics, in which objects are mirror images of each other, but are not identical.
from The Century Dictionary and Cyclopedia
- n. In optics, the power possessed by certain crystals and optically active substances of turning the plane of polarization of light to the right or left hand.
From Ancient Greek χείρ (kheir, "hand"). (Wiktionary)