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Definition of Axis of symmetry
1. Noun. (geometry) Any of one or more lines about which a geometric figure is symmetric ¹
¹ Source: wiktionary.com
Medical Definition of Axis of symmetry
1. An axis through a particle (e.g., a virus) on such a plane that, if the particle is rotated on the axis, there are two or more positions at which the particle appears identical. (05 Mar 2000)