Webster's Dictionary, 1913

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Pervasion noun [ Latin pervasio . See Pervade .] The act of pervading, passing, or spreading through the whole extent of a thing. Boyle.

Pervasive adjective Tending to pervade, or having power to spread throughout; of a pervading quality. "Civilization pervasive and general." M. Arnold.

Perverse adjective [ Latin perversus turned the wrong way, not right, past participle of pervertere to turn around, to overturn: confer French pervers . See Pervert .]
1. Turned aside; hence, specifically, turned away from the right; willfully erring; wicked; perverted.

The only righteous in a word perverse .
Milton.

2. Obstinate in the wrong; stubborn; intractable; hence, wayward; vexing; contrary.

To so perverse a sex all grace is vain.
Dryden.

Syn. -- Froward; untoward; wayward; stubborn; ungovernable; intractable; cross; petulant; vexatious. -- Perverse , Froward . One who is froward is capricious, and reluctant to obey. One who is perverse has a settled obstinacy of will, and likes or dislikes by the rule of contradiction to the will of others.

Perversed adjective Turned aside. [ Obsolete]

Perversedly adverb Perversely. [ Obsolete]

Perversely adverb In a perverse manner.

Perverseness noun The quality or state of being perverse. "Virtue hath some perverseness ." Donne.

Perversion noun [ Latin perversio : confer French perversion . See Pervert .] The act of perverting, or the state of being perverted; a turning from truth or right; a diverting from the true intent or object; a change to something worse; a turning or applying to a wrong end or use. "Violations and perversions of the laws." Bacon.

Perversity noun [ Latin perversitas : confer French perversité .] The quality or state of being perverse; perverseness.

Perversive adjective Tending to pervert.

Pervert transitive verb [ imperfect & past participle Perverted ; present participle & verbal noun Perverting .] [ French pervertir , Latin pervertere , perversum ; per + vertere to turn. See Per- , and Verse .]
1. To turnanother way; to divert. [ Obsolete]

Let's follow him, and pervert the present wrath.
Shak.

2. To turn from truth, rectitude, or propriety; to divert from a right use, end, or way; to lead astray; to corrupt; also, to misapply; to misinterpret designedly; as, to pervert one's words. Dryden.

He, in the serpent, had perverted Eve.
Milton.

Pervert intransitive verb To become perverted; to take the wrong course. [ R.] Testament of Love.

Pervert noun One who has been perverted; one who has turned to error, especially in religion; -- opposed to convert . See the Synonym of Convert .

That notorious pervert , Henry of Navarre.
Thackeray.

Perverter noun One who perverts (a person or thing). "His own parents his perverters ." South. "A perverter of his law." Bp. Stillingfleet.

Pervertible adjective Capable of being perverted.

Pervestigate transitive verb [ Latin pervestigatus , past participle of pervestigare .] To investigate thoroughly. [ Obsolete]

Pervestigation noun [ Latin pervestigatio .] Thorough investigation. [ Obsolete] Chillingworth.

Pervial adjective [ See Pervious .] Pervious. [ Obsolete] -- Per"vi*al*ly , adverb [ Obsolete] Chapman.

Pervicacious adjective [ Latin pervicax , -acis .] Obstinate; willful; refractory. [ Obsolete] -- Per`vi*ca"cious*ly , adverb -- Per`vi*ca"cious*ness , noun [ Obsolete]

Pervicacity noun Obstinacy; pervicaciousness. [ Obsolete] Bentley.

Pervicacy noun [ Latin pervicacia .] Pervicacity. [ Obsolete]

Pervigilation noun [ Latin pervigilatio , from pervigilare .] Careful watching. [ Obsolete]

Pervious adjective [ Latin pervis ; per + via a way. See Per- , and Voyage .]
1. Admitting passage; capable of being penetrated by another body or substance; permeable; as, a pervious soil.

[ Doors] . . . pervious to winds, and open every way.
Pope.

2. Capable of being penetrated, or seen through, by physical or mental vision. [ R.]

God, whose secrets are pervious to no eye.
Jer. Taylor.

3. Capable of penetrating or pervading. [ Obsolete] Prior.

4. (Zoology) Open; -- used synonymously with perforate , as applied to the nostrils or birds.

Perviousness noun The quality or state of being pervious; as, the perviousness of glass. Boyle.

Pervis noun See Parvis .

Pery noun A pear tree. See Pirie . [ Obsolete]

Pes noun ; plural Pedes . [ Latin , the foot.] (Anat.) The distal segment of the hind limb of vertebrates, including the tarsus and foot.

Pesade noun [ French] (Man.) The motion of a horse when, raising his fore quarters, he keeps his hind feet on the ground without advancing; rearing.

Pesage noun [ French, from peser to weigh.] A fee, or toll, paid for the weighing of merchandise.

Pesane noun (Anc. Armor.) See Pusane .

Pesanted adjective [ French pesant heavy.] Made heavy or dull; debased. [ Obsolete] " Pesanted to each lewd thought's control." Marston.

Peschito noun See Peshito .

Pese noun [ See Pea .] A pea. [ Obsolete] Chaucer.

Peseta noun [ Spanish ] A Spanish silver coin, and money of account, equal to about nineteen cents, and divided into 100 centesimos.

Peshito, Peshitto noun [ Syriac peshîtâ simple.] The earliest Syriac version of the Old Testament, translated from Hebrew; also, the incomplete Syriac version of the New Testament. [ Written also peschito .]

Pesky adjective [ Etymol. uncertain.] Pestering; vexatious; troublesome. Used also as an intensive. [ Colloq. & Low, U.S.] Judd.

Peso noun [ Spanish ] A Spanish dollar; also, an Argentine, Chilian, Colombian, etc., coin, equal to from 75 cents to a dollar; also, a pound weight.

Pessary noun ; plural Pessaries . [ Latin pessarium , pessum , pessus , Greek ...: confer French pessaire .] (Medicine) (a) An instrument or device to be introduced into and worn in the vagina, to support the uterus, or remedy a malposition. (b) A medicinal substance in the form of a bolus or mass, designed for introduction into the vagina; a vaginal suppository.

Pessimism noun [ Latin pessimus worst, superl. of pejor worse: confer French pessimisme . Confer Impair .]
1. (Metaph.) The opinion or doctrine that everything in nature is ordered for or tends to the worst, or that the world is wholly evil; -- opposed to optimism .

2. A disposition to take the least hopeful view of things.

Pessimist noun [ Latin pessimus worst: confer French pessimiste .]
1. (Metaph.) One who advocates the doctrine of pessimism; -- opposed to optimist .

2. One who looks on the dark side of things.

Pessimist, Pessimistic adjective (Metaph.) Of or pertaining to pessimism; characterized by pessimism; gloomy; foreboding. "Giving utterance to pessimistic doubt." Encyc. Brit.

Pessimistical adjective Pessimistic.

Pessimize intransitive verb To hold or advocate the doctrine of pessimism. London Sat. Rev.

Pessulus noun ; plural Pessuli . [ Latin , a bolt.] (Anat.) A delicate bar of cartilage connecting the dorsal and ventral extremities of the first pair of bronchial cartilages in the syrinx of birds.

Pest noun [ Latin pestis : confer French peste .]
1. A fatal epidemic disease; a pestilence; specif., the plague.

England's sufferings by that scourge, the pest .
Cowper.

2. Anything which resembles a pest; one who, or that which, is troublesome, noxious, mischievous, or destructive; a nuisance. "A pest and public enemy." South.

Pestalozzian adjective Belonging to, or characteristic of, a system of elementary education which combined manual training with other instruction, advocated and practiced by Jean Henri Pestalozzi (1746-1827), a Swiss teacher. -- noun An advocate or follower of the system of Pestalozzi.

Pestalozzianism noun The system of education introduced by Pestalozzi.

Pester transitive verb [ imperfect & past participle Pestered ; present participle & verbal noun Pestering .] [ Abbrev. from impester , from Old French empaistrier , empestrer , to entangle the feet or legs, to embarrass, French emp ê trer ; prefix em- , en- (L. in in) + Late Latin pastorium , pastoria , a fetter by which horses are prevented from wandering in the pastures, from Latin pastorius belonging to a herdsman or shepherd, pastor a herdsman. See In , and Pasture , Pastor .]
1. To trouble; to disturb; to annoy; to harass with petty vexations.

We are pestered with mice and rats.
Dr. H. More.

A multitude of scribblers daily pester the world.
Dryden.

2. To crowd together in an annoying way; to overcrowd; to infest. [ Obsolete] Milton.

All rivers and pools . . . pestered full with fishes.
Holland.

Pesterer noun One who pesters or harasses.

Pesterment noun The act of pestering, or the state of being pestered; vexation; worry. "The trouble and pesterment of children." B. Franklin.