any of four points, lines, or planes of a crystal: a center of symmetry, a reflection plane, a rotation axis, or a rotation-inversion axis.
noun, Crystallography. 1. reflection plane.
noun 1. John Addington [ad-ing-tuh n] /ˈæd ɪŋ tən/ (Show IPA), 1840–93, English poet, essayist, and critic. noun 1. John Addington (ˈædɪŋtən). 1840–93, English writer, noted for his Renaissance in Italy (1875–86) and for studies of homosexuality
sympath- pref. Variant of sympatho-.
[sim-puh-thek-tuh-mee] /ˌsɪm pəˈθɛk tə mi/ noun, plural sympathectomies. Medicine/Medical. 1. surgery that interrupts a nerve pathway of the sympathetic or involuntary nervous system. 2. Also called chemical sympathectomy. a like interruption by chemical means. sympathectomy /ˌsɪmpəˈθɛktəmɪ/ noun (pl) -mies 1. the surgical excision or chemical destruction (chemical sympathectomy) of one or more parts of the […]