Webster's Dictionary, 1913

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Persuasive adjective [ Confer French persuasif .] Tending to persuade; having the power of persuading; as, persuasive eloquence. " Persuasive words." Milton.

Persuasive noun That which persuades; an inducement; an incitement; an exhortation. -- Per*sua"sive*ly , adverb -- Per*sua"sive*ness , noun

Persuasory adjective Persuasive. Sir T. Browne.

Persulphate noun (Chemistry) A sulphate of the peroxide of any base. [ R.]

Persulphide noun (Chemistry) A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide ; -- formerly called persulphuret .

Persulphocyanate noun (Chemistry) A salt of persulphocyanic acid. [ R.]

Persulphocyanic adjective (Chemistry) Pertaining to, or designating, a yellow crystalline substance (called also perthiocyanic acid ), analogous to sulphocyanic acid, but containing more sulphur.

Persulphocyanogen noun (Chemistry) An orange-yellow substance, produced by the action of chlorine or boiling dilute nitric acid and sulphocyanate of potassium; -- called also pseudosulphocyanogen , perthiocyanogen , and formerly sulphocyanogen .

Persulphuret noun (Chemistry) A persulphide. [ Obsolete]

Pert adjective [ An aphetic form of Middle English & Old French apert open, known, true, free, or impudent. See Apert .]
1. Open; evident; apert. [ Obsolete] Piers Plowman.

2. Lively; brisk; sprightly; smart. [ Obsolete] Shak.

3. Indecorously free, or presuming; saucy; bold; impertinent. "A very pert manner." Addison.

The squirrel, flippant, pert , and full of play.
Cowper.

Pert intransitive verb To behave with pertness. [ Obsolete] Gauden.

Pertain intransitive verb [ imperfect & past participle Pertained ; present participle & verbal noun Pertaining .] [ Middle English partenen , Old French partenir , from Latin pertinere to stretch out, reach, pertain; per + tenere to hold, keep. See Per- , and Tenable , and confer Appertain , Pertinent .]
1. To belong; to have connection with, or dependence on, something, as an appurtenance, attribute, etc.; to appertain; as, saltness pertains to the ocean; flowers pertain to plant life.

Men hate those who affect that honor by ambition which pertaineth not to them.
Hayward.

2. To have relation or reference to something.

These words pertain unto us at this time as they pertained to them at their time.
Latimer.

Perterebration noun [ Latin perterebratus , past participle of perterebrare to bore through.] The act of boring through. [ Obsolete] Ainsworth.

Perthiocyanogen noun (Chemistry) Same as Persulphocyanogen .

Perthite noun [ So called from Perth , in canada.] (Min.) A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. -- Per*thit"ic adjective

Pertinacious adjective [ Latin pertinax , -acis ; per + tenax tenacious. See Per- , and Tenacious .]
1. Holding or adhering to any opinion, purpose, or design, with obstinacy; perversely persistent; obstinate; as, pertinacious plotters; a pertinacious beggar.

2. Resolute; persevering; constant; steady.

Diligence is a steady, constant, and pertinacious study.
South.

Syn. -- Obstinate; stubborn; inflexible; unyielding; resolute; determined; firm; constant; steady.

-- Per`ti*na"cious*ly , adverb -- Per`ti*na"cious*ness , noun

Pertinacity noun [ Confer French pertinacité .] The quality or state of being pertinacious; obstinacy; perseverance; persistency. Macaulay.

Syn. -- See Obstinacy .

Pertinacy noun [ Latin pertinere to pertain. See Pertinence .] The quality or state of being pertinent; pertinence. [ Obsolete]

Pertinacy noun [ Latin pertinacia , from pertinax . See Pertinacious .] Pertinacity. [ Obsolete] Chaucer.

Pertinate adjective Pertinacious. [ Obsolete]

Pertinately adverb Pertinaciously. [ Obsolete]

Pertinence, Pertinency noun [ Confer French pertinence . See Pertinent .] The quality or state of being pertinent; justness of relation to the subject or matter in hand; fitness; appositeness; relevancy; suitableness.

The fitness and pertinency of the apostle's discourse.
Bentley.

Pertinent adjective [ Latin pertinens , -entis , present participle of pertinere : confer French pertinent . See Pertain .]
1. Belonging or related to the subject or matter in hand; fit or appropriate in any way; adapted to the end proposed; apposite; material; relevant; as, pertinent illustrations or arguments; pertinent evidence.

2. Regarding; concerning; belonging; pertaining. [ R.] " Pertinent unto faith." Hooker.

Syn. -- Apposite; relevant; suitable; appropriate; fit.

-- Per"ti*nent*ly , adverb -- Per"ti*nent*ness , noun

Pertly adverb In a pert manner.

Pertness noun The quality or state of being pert.

Pertransient adjective [ Latin pertransiens , present participle of pertransire .] Passing through or over. [ R.]

Perturb transitive verb [ Latin perturbare , perturbatum ; per + turbare to disturb, from turba a disorder: confer Old French perturber . See Per- , and Turbid .]
1. To disturb; to agitate; to vex; to trouble; to disquiet.

Ye that . . . perturb so my feast with crying.
Chaucer.

2. To disorder; to confuse. [ R.] Sir T. Browne.

Perturbability noun The quality or state of being perturbable.

Perturbable adjective Liable to be perturbed or agitated; liable to be disturbed or disquieted.

Perturbance noun Disturbance; perturbation. [ R.] " Perturbance of the mind." Sharp.

Perturbate transitive verb [ From Latin perturbatus , past participle ] To perturb. [ Obsolete] Dr. H. More.

Perturbate adjective Perturbed; agitated. [ R.]

Perturbation noun [ Latin perturbatio : confer French perturbation .]
1. The act of perturbing, or the state of being perturbed; esp., agitation of mind.

2. (Astron.) A disturbance in the regular elliptic or other motion of a heavenly body, produced by some force additional to that which causes its regular motion; as, the perturbations of the planets are caused by their attraction on each other. Newcomb.

Perturbational adjective Of or pertaining to perturbation, esp. to the perturbations of the planets. "The perturbational theory." Sir J. Herschel.

Perturbative adjective Tending to cause perturbation; disturbing. Sir J. Herschel.

Perturbator noun A perturber. [ R.]

Perturbed adjective Agitated; disturbed; troubled. Shak. -- Per*turb"ed*ly , adverb

Perturber noun One who, or that which, perturbs, or cause perturbation.

Pertusate adjective [ See Pertuse .] (Botany) Pierced at the apex.

Pertuse, Pertused adjective [ Latin pertusus , past participle of pertundere to beat or thrust through, to bore through; per + tundere to beat: confer French pertus . Confer Pierce .] Punched; pierced with, or having, holes.

Pertusion noun [ Latin pertusio .] The act of punching or piercing with a pointed instrument; as, pertusion of a vein. [ R.] Arbuthnot.

2. A punched hole; a perforation. Bacon.

Pertussis noun [ New Latin , from Latin per through, very + tussis cough.] (Medicine) The whooping cough.

Peruke noun [ French perruque , Italian perrucca , parrucca , from Latin pilus hair. Confer Periwig , Wig , Peel to strip off, Plush , Pile a hair.] A wig; a periwig.

Peruke transitive verb To dress with a peruke. [ R.]

Perula noun ; plural Perulæ . [ Latin , dim. of pera wallet, Greek ...: confer French pérule .]
1. (Botany) One of the scales of a leaf bud.

2. (Botany) A pouchlike portion of the perianth in certain orchides.

Perule noun Same as Perula .

Perusal noun [ From Peruse .]
1. The act of carefully viewing or examining. [ R.] Tatler.

2. The act of reading, especially of reading through or with care. Woodward.

Peruse transitive verb [ imperfect & past participle Perused ; present participle & verbal noun Perusing .] [ Prefix per- + use .]
1. To observe; to examine with care. [ R.]

Myself I then perused , and limb by limb
Surveyed.
Milton.

2. To read through; to read carefully. Shak.

Peruser noun One who peruses.

Peruvian adjective [ Confer French péruvien , Spanish peruviano .] Of or pertaining to Peru, in South America. -- noun A native or an inhabitant of Peru.

Peruvian balsam . See Balsam of Peru , under Balsam . -- Peruvian bark , the bitter bark of trees of various species of Cinchona. It acts as a powerful tonic, and is a remedy for malarial diseases. This property is due to several alkaloids, as quinine, cinchonine, etc., and their compounds; -- called also Jesuit's bark , and cinchona . See Cinchona .

Pervade transitive verb [ imperfect & past participle Pervaded ; present participle & verbal noun Pervading .] [ Latin pervadere , pervasum ; per + vadere to go, to walk. See Per- , and Wade .]
1. To pass or flow through, as an aperture, pore, or interstice; to permeate.

That labyrinth is easily pervaded .
Blackstone.

2. To pass or spread through the whole extent of; to be diffused throughout.

A spirit of cabal, intrigue, and proselytism pervaded all their thoughts, words, and actions.
Burke.