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periscope a tubular optical instrument fitted with mirrors and prisms so as to allow one to see what is not in the direct line of sight or what is obstructed from sight.
perish to die or be destroyed, esp. in an untimely or unnatural way. [2 definitions]
perishable subject to death, decay, or destruction. [3 definitions]
peristalsis a process of muscular contractions and relaxations along a tubular muscular system, such as that which forces food through the digestive system.
peristome the area or appendages surrounding certain mouthlike openings, as in mosses and some invertebrates.
peristyle a row or series of architectural columns forming an enclosure around a building or open space, or the open space so enclosed, esp. as used in classical Greek architecture or copies of it.
peritoneum the membrane that lines the abdomen and encloses the abdominal organs.
peritonitis inflammation of the membrane that lines the abdominal cavity.
periwig a wig, esp. of the type worn by men in the seventeenth and eighteenth centuries.
periwinkle1 any of various edible marine snails, or its thick, whorled, conical shell.
periwinkle2 any of several related low, trailing plants that have shiny evergreen leaves and bear small flowers, usu. in shades of blue, purple, or white.
perjure to render (oneself) guilty of perjury by giving false testimony under oath.
perjured guilty of perjury. [2 definitions]
perjury the intentional giving of false testimony under oath in a court or other official proceeding.
perk1 to recover good health or spirits (usu. fol. by up). [5 definitions]
perk2 (informal) to percolate.
perk3 (informal) a privilege or benefit, as of a high rank or position; perquisite.
perky lively, jaunty, or pert.
perlite a volcanic glass with distinctive concentric cracks, used in the manufacture of concrete and plaster, and thermal and acoustic insulation.
perm (informal) a process for putting a long-lasting curl or wave in the hair by applying a chemical solution and rolling the hair on curlers; permanent. [3 definitions]
permafrost the permanently frozen subsoil layer or areas found in arctic and subarctic regions.