periodoscope

[Gr. periodos =a period, and skopeō -to see, to observe.] Surg. An instrument for determining the date of menstruation, labor, ., and for other calculations. pěr-1-œ-çi, s. pl. [Gr. perioikoi: pref. peri-, and oikeō =to live.] 1. The name given to the original Achæan inhabitants of Laconia by their Dorian conquerors. 2. Geog .: The inhabitants of such parts of the earth as are in the same latitudes, but whose longitudes differ by 185°, so that when it is noon with one it is midnight with the other. pěr-1-œ-cian, s. [PERICECI.] One of the Periœci. pěr-1-õph-thăl-mus, s. [Pref. peri-, and Gr. ophthalmos an eye.] Ichthy.: A genus of Gobiidæ, from the coasts of the Indo-Pacific, remarkable for their prominent retractile eyes, which enable them to see in the air as well as in the water, and for their strong ventral and pectoral fins, by the aid of which they can hop freely over the ground, when they leave the water, as is their habit at ebb tide, to hunt small crustaceans. The species are few in number; but Periophthalmus koelreuteri is one of the commonest fishes of the Indian Ocean. IMG:content-0901.png:[blocks in formation] osteum. IMG:content-0902.png:[blocks in formation] Internal periosteum : Anat .: The medullary membrane. pine, pit, sire, sir, marine; gō, pot, IMG:content-0903.png:[blocks in formation] per-i-pet-a-lous, a . [Pref. peri- ; Gr. petal on =a leaf, and Eng. suff. -ous .] Bot.: Surrounded or situated about the petals. (Used of some nectarines.) *pěr-i-pě-ti-a, s . [Gr. peripeteia =a turning about, from peripetes falling round; pref. peri-, Anat .: A sense-organ toward the periphery or circumference of the body, not in its interior. (Foster: Physiol .) pěr-iph-er-al-ly, adv . [Eng. peripheral ; -ly.] In a peripheral manner; so as to be peripheral. pěr-1-pher-Ic, per-1-pher-Ic-al, a. [English peripher(y); -ic, -ical ; Fr. périphérique .] 1. Walking about; itinerant; perambulating. 2. Pertaining to the system of philosophy taught a periphery. Pathol.: Progre ive muscular atrophy (q. v.). *pěr-i-pher'-ic-al-ly, adv . [Eng. peripherical ; ly.] Round, so as to form a circle. "I have been clipping for some years Cedars peripheric- ally." Gardeners' Chronicle, No. 404, p. 402. 1. Ord. Lang . The outside or superficial portions of a body; the surface. "By the apposition of new cells of the yolk to its pe- riphery ."- Todd & Bowman : Physiol. Anat ., ii. 582. 2. Geometry, .: The bounding line of a plane figure; the perimeter; the circumference. pěr-i-pho-răn'-thi-um, s. [Pref. peri-; Greek photos-bearing and antio a flower. peri ; Bot .: The name given by Richard to the Periclini- um (q. v.). per-i-phyl-li-a, s . pl . [Pref. peri- , and Greck phyllon a leaf.] Bot .: Link's name for the squamule in the flower of gra es. periscopic-spectacles, s. pl. Optics: Spectacles having concavo-convex lenses, with their curvature in the same direction as that of the eye, for increasing the distinctne of objects when viewed obliquely.