principal axis

noun

prin·​ci·​pal axis ˈprin(t)-sə-pəl- How to pronounce principal axis (audio)
: the line with respect to which a spherical mirror or lens system is symmetrical and which passes through both the center of the surfaces and their centers of curvature

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Cite this Entry

“Principal axis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/principal%20axis. Accessed 30 Sep. 2023.

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