any cactus of the genus Opuntia, esp prickly pear, having fleshy branched stems and green, red, or yellow flowers
[op-ti-kuh l] /ˈɒp tɪ kəl/ adjective 1. of, relating to, or applying or the principles of optics. 2. constructed to assist sight or to correct defects in vision. 3. of or relating to sight or vision; visual. 4. of or relating to the eye. 5. of or relating to an optician or opticians or to […]
noun, Chemistry. 1. stereoisomerism in which the isomers are identical in molecular weight and most chemical and physical properties but differ in their effect on the rotation of polarized light. noun 1. isomerism of chemical compounds in which the two isomers differ only in that their molecules are mirror images of each other See also […]
noun, Chemistry. 1. any of two or more isomers exhibiting optical isomerism. optical isomer See enantiomer.
- Optical image
optical image n. An image formed by the refraction or reflection of light.