Periscopic spectacles
Periscopic Per`i*scop"ic, a. [Cf. F. p['e]riscopique.] Viewing all around, or on all sides. [1913 Webster] [1913 Webster]

{Periscopic spectacles} (Opt.), spectacles having concavo-convex or convexo-concave lenses with a considerable curvature corresponding to that of the eye, to increase the distinctness of objects viewed obliquely. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Periscopic — Per i*scop ic, a. [Cf. F. p[ e]riscopique.] Viewing all around, or on all sides. [1913 Webster] [1913 Webster] {Periscopic spectacles} (Opt.), spectacles having concavo convex or convexo concave lenses with a considerable curvature corresponding… …   The Collaborative International Dictionary of English

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