periscopic

adj of or like a periscope （似）潜望镜的.

perigee, perihelion, peril, perilous, perimeter, period, period piece, periodic, periodic table, periodical, periodicity, peripatetic, peripatetically, peripheral, peripherally, periphery, periphrasis, periphrastic, periphrastically, periscope, perish, perishable, perishables, perished, perisher, perishing, peristyle, peritonitis, periwinkle, perjure, perjurer, perjury, perk, perkily, perkiness, perky, perm, permafrost, permanence, permanency,