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. (Zoöl.) Same as Pleuron.

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

(Pleth`o*ret"ic) a. Plethoric. [Obs.] Johnson.

(Ple*thor"ic) a. [Gr. cf. F. pléthorique.] Haeving a full habit of body; characterized by plethora or excess of blood; as, a plethoric constitution; — used also metaphorically. "Plethoric phrases." Sydney Smith. "Plethoric fullness of thought." De Quincey.

(Ple*thor"ic*al) a. Plethoric. [R.] — Ple*thor"ic*al*ly, adv. Burke.

(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.

(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. Pleuræ 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. (Zoöl.) Same as Pleuron.

(Pleu"ral) a. (Anat.) Of or pertaining to the pleura or pleuræ, 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. pleurésie, L. pleurisis, pleuritis, Gr pleyri^tis 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.

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