Part 197

Perk"y (?), a. Perk; pert; jaunty; trim.

There amid perky larches and pines.

Tennyson.

Per*la"ceous (?), a. [See Pearl.] Pearly; resembling pearl.

Per"lid (?), n. (Zoˆl.) Any insect of the genus Perla, or family PerlidÊ. See Stone fly, under Stone.

Per"lite (?), n. (Min.) Same as Pearlite.

Per*lit"ic (?), a. (Min.) Relating to or resembling perlite, or pearlstone; as, the perlitic structure of certain rocks. See Pearlite.

Per"lous (?), a. Perilous. [Obs.] Spenser.

Per`lus*tra"tion (?), n. [L. perlustrare to wander all through, to survey. See 3d Luster.] The act of viewing all over. [Archaic] Howell.

Per"ma*na*ble (?), a. Permanent; durable. [Obs.] Lydgate.

{ Per"ma*nence (?), Per"ma*nen*cy (?), } n. [Cf. F. permanence.] The quality or state of being permanent; continuance in the same state or place; duration; fixedness; as, the permanence of institutions; the permanence of nature.

Per"ma*nent (?), a. [L. permanens, -entis, p. pr. of permanere to stay or remain to the end, to last; per + manere to remain: cf. F. permanent. See Per-, and Mansion.] Continuing in the same state, or without any change that destroys form or character; remaining unaltered or unremoved; abiding; durable; fixed; stable; lasting; as, a permanent impression.

Eternity stands permanent and fixed.

Dryden.

Permanent gases (Chem. & Physics), hydrogen, oxygen, nitrogen, and carbon monoxide; -- also called incondensible or incoercible gases, before their liquefaction in 1877. -- Permanent way, the roadbed and superstructure of a finished railway; -- so called in distinction from the contractor's temporary way. -- Permanent white (Chem.), barium sulphate (heavy spar), used as a white pigment or paint, in distinction from white lead, which tarnishes and darkens from the formation of the sulphide.

Syn. -- Lasting; durable; constant. See Lasting.

Per"ma*nent*ly, adv. In a permanent manner.

Per*man"ga*nate (?), n. (Chem.) A salt of permanganic acid.

Potassium permanganate. (Chem.) See Potassium permanganate, under Potassium.

Per`man*gan"ic (?), a. (Chem.) Pertaining to, or designating, one of the higher acids of manganese, HMnO4, which forms salts called permanganates.

Per*man"sion (?), n. [L. permansio. See Permanent.] Continuance. [Obs.] Sir T. Browne.

Per`me*a*bil"i*ty (?), n. [Cf. F. permÈabilitÈ.] The quality or state of being permeable.

Magnetic permeability (Physics), the specific capacity of a body for magnetic induction, or its conducting power for lines of magnetic force. Sir W. Thomson.

Per"me*a*ble (?), a. [L. permeabilis: cf. F. permÈable. See Permeate.] Capable of being permeated, or passed through; yielding passage; passable; penetrable; -- used especially of substances which allow the passage of fluids; as, wood is permeable to oil; glass is permeable to light. I. Taylor.

Per"me*a*bly, adv. In a permeable manner.

Per"me*ant (?), a. [L. permeans, p. pr.] Passing through; permeating. [R.] Sir T. Browne.

Per"me*ate (?), v. t. [imp. & p. p. Permeated (?); p. pr. & vb. n. Permeating.] [L. permeatus, p. p. of permeare to permeate; per + meare to go, pass.] 1. To pass through the pores or interstices of; to penetrate and pass through without causing rupture or displacement; -- applied especially to fluids which pass through substances of loose texture; as, water permeates sand. Woodward.

2. To enter and spread through; to pervade.