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Webster 1913 Edition
Periscopic
Perˊi-scop′ic
,Adj.
[Cf. F.
périscopique
.] Viewing all around, or on all sides.
2.
of or relating to a periscope{2}.
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.