periscopic
a. காட்சி நேர்வரை திறம்பியைக் காண உதவுகிற.
Per`i*scop"ic, a. Etym: [Cf. F. périscopique.] Defn: Viewing all around, or on all sides. 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.