Periscii :: Periscii (n. pl.) Those who live within a polar circle, whose shadows, during some summer days, will move entirely round, falling toward every point of the compass..
Periscope :: Periscope (n.) A general or comprehensive view.
Periscope :: Periscope (n.) an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water..
Periscopic :: Periscopic (a.) Viewing all around, or on all sides..
Periscopic :: Periscopic (a.) of or relating to a periscope{2}.