(Opt.), spectacles having concavo-convex or convexo-concave lenses with a considerable curvature corresponding to that of the eye, to increase the distinctness of objects viewed obliquely.

Perish
(Per"ish) v. i. [imp. & p. p. Perished ; p. pr. & vb. n. Perishing.] [OE. perissen, perisshen, F. périr, p. pr. périssant, L. perire to go or run through, come to nothing, perish; per through + ire to go. Cf. Issue, and see -ish.] To be destroyed; to pass away; to become nothing; to be lost; to die; hence, to wither; to waste away.

I perish with hunger!
Luke xv. 17.

Grow up and perish, as the summer fly.
Milton.

The thoughts of a soul that perish in thinking.
Locke.

Perish
(Per"ish), v. t. To cause perish. [Obs.] Bacon.

Perishability
(Per`ish*a*bil"i*ty) n. Perishableness.

Perishable
(Per"ish*a*ble) a. [F. périssable.] Liable to perish; subject to decay, destruction, or death; as, perishable goods; our perishable bodies.

Perishableness
(Per"ish*a*ble*ness), n. The quality or state of being perishable; liability to decay or destruction. Locke.

Perishably
(Per"ish*a*bly), adv. In a perishable degree or manner.

Perishment
(Per"ish*ment) n. [Cf. OF. perissement.] The act of perishing. [R.] Udall.

Perisoma
(||Per`i*so"ma) n.; pl. Perisomata [NL.] (Zoöl.) Same as Perisome.

Perisome
(Per"i*some) n. [Pref. peri- + -some body.] (Zoöl.) The entire covering of an invertebrate animal, as echinoderm or cœlenterate; the integument.

Perisperm
(Per"i*sperm) n. [F. périsperme. See Peri-, and Sperm.] (Bot.) The albumen of a seed, especially that portion which is formed outside of the embryo sac.Per`i*sper"mic a.

Perispheric
(Per`i*spher"ic Per`i*spher"ic*al) a. Exactly spherical; globular.

Perispomenon
(||Per`i*spom"e*non) n.; pl. Perispomena [NL., from Gr. pr. pass. p. of to draw around, to circumflex; around + to draw.] (Gr. Gram.) A word which has the circumflex accent on the last syllable. Goodwin.

Perispore
(Per"i*spore) n. (Bot.) The outer covering of a spore.

Perissad
(Per"is*sad) a. [Gr. odd, from over.] (Chem.) Odd; not even; — said of elementary substances and of radicals whose valence is not divisible by two without a remainder. Contrasted with artiad.

Perisse
(Per"isse) v. i. To perish. [Obs.] Chaucer.

Perissodactyl
(Per`is*so*dac"tyl) n. (Zoöl.) One of the Perissodactyla.

Perissodactyla
(||Per`is*so*dac"ty*la) n. pl. [NL., from Gr. odd (fr. over) + finger.] (Zoöl.) A division of ungulate mammals, including those that have an odd number of toes, as the horse, tapir, and rhinoceros; — opposed to Artiodactyla.

Perissological
(Per`is*so*log"ic*al) a. [Cf. F. périssologique.] Redundant or excessive in words. [R.]

Periscopic spectacles

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