mirror symmetryn.
/ˌmɪrə ˈsɪmᵻtri/, U.S. /ˌmɪrər ˈsɪmᵻtri/ Symmetry about a plane, as between an object and its reflection.
ΚΠ
1934 Amer. Naturalist 68 475 The frequent occurrence of mirror-image symmetry between unpaired portions of zygotene homologues.]
1937 Proc. National Acad. Sci. U.S.A. 23 392 We have..no direct evidence for the mirror symmetry of the upper and lower shaded areas about a vertical line.
1950 Arkiv för Fysik 2 196 The electrical..field is assumed to have..mirror symmetry with respect to the xy-plane.
1981 C. H. L. Smith in J. H. Mulvey Nature of Matter iii. 57 Next we consider..reflection or mirror symmetry.
1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) ii. 147/2 The nucleus divides, cytokinesis ensues, and two offspring cells with a plane of mirror symmetry between them separate.
This is a new entry (OED Third Edition, March 2002; most recently modified version published online March 2022).
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n.1937