Periplus, per′i-plus, n. a circumnavigation. [Gr. peri, around, ploos, plous, a voyage.]
Periptery, pe-rip′tėr-i, n. (archit.) a building surrounded by a wing or row of columns.—adjs. Perip′teral, having a periptery or range of columns all round, said of a temple, &c.; Perip′terous, feathered on all sides: peripteral. [Gr. peripteros—peri, about, pteron, a wing.]
Perirhinal, per-i-rī′nal, adj. surrounding the nose.
Periscii, pe-rish′i-ī, n.pl. the people within the polar circle, because their shadows, on some days in summer, move round in a complete circle, owing to the fact that on those days the sun does not set.—adj. Peris′cian. [Gr. periskios, throwing a shadow all round; peri, around, skia, a shadow.]
Periscope, per′i-skōp, n. an instrument like the altiscope, used in directing submarine boats.—adj. Periscop′ic. [Gr. peri, about, skopein, to see.]
Perish, per′ish, v.i. to pass away completely: to waste away: to decay: to lose life: to be destroyed: to be ruined or lost.—ns. Perishabil′ity, Per′ishableness, the quality of being liable to speedy decay or destruction.—adj. Per′ishable, that may perish: subject to speedy decay.—adv. Per′ishably.—v.i. Per′ishen (Spens.), to perish. [O. Fr. perir, pr.p. perissant—L. perīre, to perish—per, completely, īre, to go.]
Perisperm, per′i-spėrm, n. (bot.) that which is round a seed, the albumen.—adj. Perisper′mic. [Gr. peri, around, sperma, seed.]
Perispheric, -al, per-i-sfer′ik, -al, adj. globular.
Perispore, per′i-spōr, n. the outer covering of a spore.
Perissad, pe-ris′ad, n. (chem.) an atom whose valency is represented by an odd number—opp. to Artiad—also adj. [Gr. perissos, beyond the regular number.]