The Collaborative International Dictionary
Periscopic \Per`i*scop"ic\, a. [Cf. F. p['e]riscopique.] 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.
Wiktionary
a. Relating to periscopes and their use.
Usage examples of "periscopic".
There, in the very ground beneath her feet, was a periscopic reflection of what was going on above ground.
She guessed he meant it was time to get busy and folded out the periscopic apparatus of the viewfinder so that she could look through it right in front of her, then with her other hand found the shutter button.
Each of the sniper members pulled out periscopic night vision devices and checked the bunkers.
There was the silence of a ghost in his going, and instead of shoving up his head, he used a small periscopic affair of a slender tube and mirrors to survey the terrain ahead.
In the special periscopic device, Knut Aage was watching the slender needle of Kama’s submarine shooting toward them.