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peri·to·ne·um noun, plural -ne·ums or -nea : the smooth transparent serous membrane that lines the cavity of the abdomen

— peri·to·ne·al adjective

peri·to·ni·tis noun : inflammation of the peritoneum

peri·wig noun : WIG

1periwinkle noun : a usu. blue-flowered creeping plant cultivated as a ground cover

2periwinkle noun : any of various small edible seashore snails

per·ju·ry noun : the voluntary violation of an oath to tell the truth : lying under oath

— per·jure verb

— per·jur·er noun

1perk verb 1 : to thrust (as the head) up impudently or jauntily

2 : to regain vigor or spirit

3 : to make trim or brisk : FRESHEN

2perk verb : PERCOLATE

3perk noun : PERQUISITE — usu. used in pl.

perky adjective : sprightly in manner or appearance

Synonyms

active, animate, animated, brisk, energetic, frisky, gay, jaunty, lively, peppy, spirited, sprightly, springy

per·lite noun : volcanic glass that when expanded by heat forms a lightweight material used esp. in concrete and plaster and for potting plants

1perm noun : PERMANENT

2perm verb : to give (hair) a permanent

3perm abbreviation permanent

per·ma·frost noun : a permanently frozen layer below the surface in frigid regions of a planet

1permanent adjective : continuing or enduring without fundamental or marked change

— per·ma·nence noun

— per·ma·nen·cy noun

Synonyms

ceaseless, dateless, deathless, endless, eternal, everlasting, immortal, perpetual, undying, unending—more at EVERLASTING

2permanent noun : a long-lasting hair wave or straightening

per·ma·nent·ly adverb : in a permanent manner

Synonyms

always, eternally, ever, everlastingly, forever, perpetually—more at EVER

permanent press noun : the process of treating fabrics with chemicals (as resin) and heat for setting the shape and for aiding wrinkle resistance

per·me·able adjective : having small openings that permit liquids or gases to seep through

— per·me·a·bil·i·ty noun

Synonyms

passable, penetrable, porous—more at PENETRABLE

per·me·ate verb -at·ed; -at·ing 1 : to spread or diffuse through : PERVADE

2 : to seep through the pores of : PENETRATE

— per·me·ation noun

Synonyms

percolate, suffuse, transfuse; also diffuse (through), impregnate, pass (into), penetrate; fill (up); drench, infuse, saturate, soak, steep; flood, glut

Perm·ian adjective : of, relating to, or being the latest period of the Paleozoic era

— Permian noun

per·mis·si·ble adjective : that may be permitted : ALLOWABLE

Synonyms

admissible, allowable, sufferable; also acceptable, bearable, endurable, tolerable; accredited, allowed, authorized, certified, endorsed, OK, permitted, sanctioned, warranted, mandatory, ordered, required

Antonyms

banned, barred, forbidden, impermissible, interdicted, prohibited, proscribed

per·mis·sion noun : formal consent : AUTHORIZATION

Synonyms

allowance, authorization, clearance, concurrence, consent, leave, license, sanction, sufferance; also imprimatur, seal, signature, stamp; accreditation, certification; liberty, pass; concession, patent, permit; acceptance, acquiescence, agreement, assent, OK; accord, grant

Antonyms

interdiction, prohibition, proscription

per·mis·sive adjective : granting permission; especially : INDULGENT

— per·mis·sive·ly adverb

— per·mis·sive·ness noun

1permit verb per·mit·ted; per·mit·ting 1 : to consent to : ALLOW <~ access>

2 : to make possible

3 : to give leave <~ him to go>

Synonyms

[1, 2, 3] allow, have, let, suffer

2permit noun : a written permission : LICENSE

per·mu·ta·tion noun 1 : a major or fundamental change

2 : the act or process of changing the order of an ordered set of objects

per·ni·cious adjective [ORIGIN: ME, fr. AF, fr. L perniciosus, fr. pernicies destruction, fr. per- through + nec-, nex violent death]

: very destructive or injurious

— per·ni·cious·ly adverb

Synonyms

adverse, bad, baleful, baneful, damaging, deleterious, detrimental, evil, harmful, hurtful,