v. i. to breathe rapidly and deeply; to breathe excessively; as, The mountain climber started to hyperventilate. [ WordNet 1.5 ]

n. 1. The act or process of hyperventilating; breathing rapidly and deeply. [ PJC ]

2. (Med.) A condition in which alveolar carbon dioxide concentration is markedly lower than normal, usually due to breathing rapidly and deeply. [ PJC ]

n. The quality of being imperviable. [ 1913 Webster ]

a. Not pervious; impervious. [ R. ] -- Im*per"vi*a*ble*ness, n. [R.] [1913 Webster]

a. [ L. impervius; pref. im- not + per through + via way. See Voyage. ] Not pervious; not admitting of entrance or passage through; as, a substance impervious to water or air. [ 1913 Webster ]

This gulf impassable, impervious. Milton. [ 1913 Webster ]

The minds of these zealots were absolutely impervious. Macaulay.

Syn. -- Impassable; pathless; impenetrable; imperviable; impermeable.

-- Im*per"vi*ous*ly, adv. -- Im*per"vi*ous*ness, n. [ 1913 Webster ]

v. t. [ imp. & p. p. Pervaded; p. pr. & vb. n. Pervading. ] [ L. 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. [ 1913 Webster ]

That labyrinth is easily pervaded. Blackstone. [ 1913 Webster ]

2. To pass or spread through the whole extent of; to be diffused throughout. [ 1913 Webster ]

A spirit of cabal, intrigue, and proselytism pervaded all their thoughts, words, and actions. Burke. [ 1913 Webster ]

adj. Being spread throughout.
Syn. -- pervasive. [ WordNet 1.5 ]

n. The concentration of a colloidal solution whose colloid will not pass through a semipermeable membrane; the solution is placed in a bag of the membrane and the solvent is evaporated off. [ WordNet 1.5 ]

n. [ L. pervasio. See Pervade. ] The act of pervading, passing, or spreading through the whole extent of a thing. Boyle. [ 1913 Webster ]

a. Tending to pervade, or having power to spread throughout; of a pervading quality. “Civilization pervasive and general.” M. Arnold. [ 1913 Webster ]

n. The quality of filling or spreading throughout; as, the pervasiveness of the odor of cabbage in tenement hallways. [ WordNet 1.5 ]

a. [ L. perversus turned the wrong way, not right, p. p. of pervertereto turn around, to overturn: cf. F. pervers. See Pervert. ] 1. Turned aside; hence, specifically, turned away from the right; willfully erring; wicked; perverted. [ 1913 Webster ]

The only righteous in a world perverse. Milton. [ 1913 Webster ]

2. Obstinate in the wrong; stubborn; intractable; hence, wayward; vexing; contrary. [ 1913 Webster ]

To so perverse a sex all grace is vain. Dryden. [ 1913 Webster ]

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. [ 1913 Webster ]

a. Turned aside. [ Obs. ] [ 1913 Webster ]

adv. Perversely. [ Obs. ] [ 1913 Webster ]

adv. In a perverse manner. [ 1913 Webster ]

n. The quality or state of being perverse. “Virtue hath some perverseness.” Donne. [ 1913 Webster ]

n. [ L. perversio: cf. F. 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. [ 1913 Webster ]

n. [ L. perversitas: cf. F. perversité. ] The quality or state of being perverse; perverseness. [ 1913 Webster ]

a.Tending to pervert. [ 1913 Webster ]

v. i. To become perverted; to take the wrong course. [ R. ] Testament of Love. [ 1913 Webster ]

v. t. [ imp. & p. p. Perverted; p. pr. & vb. n. Perverting. ] [ F. pervertir, L. pervertere, perversum; per + vertere to turn. See Per-, and Verse. ] 1. To turn another way; to divert. [ Obs. ] [ 1913 Webster ]

Let's follow him, and pervert the present wrath. Shak. [ 1913 Webster ]

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 intentionally; as, to pervert one's words. Dryden. [ 1913 Webster ]

He, in the serpent, had perverted Eve. Milton. [ 1913 Webster ]

n. One who has been perverted; one who has turned to error, especially in religion; -- opposed to convert. See the Synonym of Convert. [ 1913 Webster ]

That notorious pervert, Henry of Navarre. Thackeray. [ 1913 Webster ]

n. One who perverts (a person or thing). “His own parents his perverters.” South. “A perverter of his law.” Bp. Stillingfleet. [ 1913 Webster ]

a. Capable of being perverted. [ 1913 Webster ]

v. t. [ L. pervestigatus, p. p. of pervestigare. ] To investigate thoroughly. [ Obs. ] [ 1913 Webster ]

n. [ L. pervestigatio. ] Thorough investigation. [ Obs. ] Chillingworth. [ 1913 Webster ]

a. [ See Pervious. ] Pervious. [ Obs. ] -- Per"vi*al*ly, adv. [Obs.] Chapman. [1913 Webster]

a. [ L. pervicax, -acis. ] Obstinate; willful; refractory. [ Obs. ] -- Per`vi*ca"cious*ly, adv. -- Per`vi*ca"cious*ness, n. [ Obs. ] [ 1913 Webster ]

n. Obstinacy; pervicaciousness. [ Obs. ] Bentley. [ 1913 Webster ]

n. [ L. pervicacia. ] Pervicacity. [ Obs. ] [ 1913 Webster ]

n. [ L. pervigilatio, fr. pervigilare. ] Careful watching. [ Obs. ] [ 1913 Webster ]

a. [ L. 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. [ 1913 Webster ]

[ Doors ] . . . pervious to winds, and open every way. Pope. [ 1913 Webster ]

2. Capable of being penetrated, or seen through, by physical or mental vision. [ R. ] [ 1913 Webster ]

God, whose secrets are pervious to no eye. Jer. Taylor. [ 1913 Webster ]

3. Capable of penetrating or pervading. [ Obs. ] Prior. [ 1913 Webster ]

4. (Zool.) Open; -- used synonymously with perforate, as applied to the nostrils or birds. [ 1913 Webster ]

n. The quality or state of being pervious; as, the perviousness of glass. Boyle. [ 1913 Webster ]

n. See Parvis. [ 1913 Webster ]

a. [ L. semper always + virens, p. pr. of virere to be green. ] Always fresh; evergreen. [ R. ] Smart. [ 1913 Webster ]

n. [ L. semperviva, sempervivum, fr. sempervivus ever-living; semper always + vivus living. ] (Bot.) The houseleek. [ 1913 Webster ]

‖n. (Bot.) A genus of fleshy-leaved plants, of which the houseleek (Sempervivum tectorum) is the commonest species. [ 1913 Webster ]

a. [ L. supervacaneus, supervacuus; super over + vacuus empty. ] Serving no purpose; superfluous; needless. [ Obs. ] Howell. [ 1913 Webster ]

v. i. [ imp. & p. p. Supervened p. pr. & vb. n. Supervening. ] [ L. supervenire, superventum, to come over, to come upon; super over + venire to come. See Super-, and Come, and cf. Overcome. ] To come as something additional or extraneous; to occur with reference or relation to something else; to happen upon or after something else; to be added; to take place; to happen. [ 1913 Webster ]

Such a mutual gravitation can never supervene to matter unless impressed by divine power. Bentley. [ 1913 Webster ]

A tyrany immediately supervened. Burke. [ 1913 Webster ]

a. [ L. superveniens, p. pr. ] Coming as something additional or extraneous; coming afterwards. [ 1913 Webster ]

That branch of belief was in him supervenient to Christian practice. Hammond. [ 1913 Webster ]

Divorces can be granted, a mensa et toro, only for supervenient causes. Z. Swift. [ 1913 Webster ]

n. [ L. superventio. ] The act of supervening. Bp. Hall. [ 1913 Webster ]

n. Supervision. Walpole. [ 1913 Webster ]

v. t. [ imp. & p. p. Supervised p. pr. & vb. n. Supervising. ] [ Pref. super- + L. visere to look at attentively, to view, surely, intens. from videre, visum, to see. Cf. Survise, and Survey. ] 1. To oversee for direction; to superintend; to inspect with authority; as, to supervise the construction of a steam engine, or the printing of a book. [ 1913 Webster ]

2. To look over so as to read; to peruse. [ Obs. ] Shak. [ 1913 Webster ]

Syn. -- See Superintend. [ 1913 Webster ]

n. Supervision; inspection. [ Obs. ] [ 1913 Webster ]

n. The act of overseeing; inspection; superintendence; oversight. [ 1913 Webster ]

a. Supervisory. [ R. ] [ 1913 Webster ]

n. 1. One who supervises; an overseer; an inspector; a superintendent; as, a supervisor of schools. [ 1913 Webster ]

2. A spectator; a looker-on. [ Obs. ] Shak. [ 1913 Webster ]

a. Of or pertaining to supervision; as, supervisory powers. [ 1913 Webster ]

v. t. [ L. supervivere. See Survive. ] To survive; to outlive. [ Obs. ] [ 1913 Webster ]

a. [ L. supervolutus, p. p. of supervolvere to roll over; super over + volvere to roll. ] (Bot.) Having a plaited and convolute arrangement in the bud, as in the morning-glory. [ 1913 Webster ]