Bible Dictionaries
Plano-Concave
Webster's Dictionary
(a.) Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens.
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Bibliography Information
Webster, Noah. Entry for 'Plano-Concave'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/plano-concave.html. 1828.