Part 344

Pleth"o*ry (?), n. Plethora. Jer. Taylor.

{ ||Pleth"ron (?), ||Pleth"rum (?), } n.; pl. Plethra (#). [NL., fr. Gr. &?;.] (Gr. Antiq.) A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.

||Pleth"ys*mo*graph (?), n. [Gr. &?; an enlargement + -graph.] ||(Physiol.) An instrument for determining and registering the ||variations in the size or volume of a limb, as the arm or leg, and ||hence the variations in the amount of blood in the limb.

-- Pleth`ys*mo*graph"ic (#), a.

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Pleth`ys*mog"ra*phy (?), n. (Physiol.) The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply.

||Pleu"ra (?), n., pl. of Pleuron.

Pleu"ra, n.; pl. L. PleurÊ (#), E. Pleuras (#). [NL., n. fem., fr. Gr. &?; a rib, the side.] 1. (Anat.) (a) The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane. (b) The closed sac formed by the pleural membrane about each lung, or the fold of membrane connecting each lung with the body wall.

2. (Zoˆl.) Same as Pleuron.

Pleu"ral (?), a. (Anat.) Of or pertaining to the pleura or pleurÊ, or to the sides of the thorax.

||Pleu*ral"gi*a (?), n. [NL., fr. Gr. &?; rib + &?; pain.] (Med.) Pain ||in the side or region of the ribs.

||Pleu`ra*poph"y*sis (?), n.; pl. Pleurapophyses (#). [NL. See Pleura, ||and Apophysis.] (Anat.) One of the ventral processes of a vertebra, ||or the dorsal element in each half of a hemal arch, forming, or ||corresponding to, a vertebral rib. -- Pleu*rap`o*phys"i*al (#), a. ||Owen.

Pleu*ren"chy*ma (?), n. [Gr. &?; side + &?;, as in parenchyma.] (Bot.) A tissue consisting of long and slender tubular cells, of which wood is mainly composed.

Pleu"ric (?), a. (Anat.) Pleural.

Pleu"ri*sy (?), n. [F. pleurÈsie, L. pleurisis, pleuritis, Gr pleyri^tis (sc. no`sos), fr. pleyra` rib, side.] (Med.) An inflammation of the pleura, usually accompanied with fever, pain, difficult respiration, and cough, and with exudation into the pleural cavity.

Pleurisy root. (Bot.) (a) The large tuberous root of a kind of milkweed (Asclepias tuberosa) which is used as a remedy for pleuritic and other diseases. (b) The plant itself, which has deep orange-colored flowers; -- called also butterfly weed.

Pleu"rite (?), n. (Zoˆl.) Same as Pleuron.

{ Pleu*rit"ic (?), Pleu*rit"ic*al (?), } a. [L. pleuriticus, Gr. &?;: cf. F. pleurÈtique.] (Med.) (a) Of or pertaining to pleurisy; as, pleuritic symptoms. (b) Suffering from pleurisy.

||Pleu*ri"tis (?), n. [L.] (Med.) Pleurisy.

Pleu"ro- (?). [See Pleura.] A combining form denoting relation to a side; specif., connection with, or situation in or near, the pleura; as, pleuroperitoneum.

||Pleu`ro*brach"i*a (?), n. [NL. See Pleuro-, and Brachium.] (Zoˆl.) A ||genus of ctenophores having an ovate body and two long plumose ||tentacles.

Pleu"ro*branch (?), n. [See Pleuro- , and Branchia.] (Zoˆl.) Any one of the gills of a crustacean that is attached to the side of the thorax.

||Pleu`ro*bran"chi*a (?), n.; pl. PleuroeranchiÊ (#). [NL.] (Zoˆl.) ||Same as Pleurobranch.

Pleu"ro*carp (?), n. [Pleuro- + Gr. &?; fruit.] (Bot.) Any pleurocarpic moss.

{ Pleu`ro*car"pic (?), Pleu`ro*car"pous (?), } a. (Bot.) Side-fruited; -- said of those true mosses in which the pedicels or the capsules are from lateral archegonia; -- opposed to acrocarpous.

||Pleu`ro*cen"trum (?), n. [NL. see Pleuro-, and Centrum.] (Anat.) One ||of the lateral elements in the centra of the vertebrÊ in some fossil ||batrachians.

||Pleu*rod"e*res (?), n. pl. [NL., fr. Gr. &?; the side + &?; the ||neck.] (Zoˆl.) A group of fresh-water turtles in which the neck can ||not be retracted, but is bent to one side, for protection. The ||matamata is an example.

Pleu"ro*dont (?), a. [Pleuro- + Gr. &?;, &?;, a tooth.] (Anat.) Having the teeth consolidated with the inner edge of the jaw, as in some lizards.