Webster's Dictionary, 1913

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Pleonastically adverb In a pleonastic manner.

Pleopod noun ; plural English Pleopods , Latin Pleopoda . [ Greek ... to swim + -pod .] (Zoology) One of the abdominal legs of a crustacean. See Illust. under Crustacea .

Plerome noun [ Greek ... that which fills up, from ... to fill.] (Botany) The central column of parenchyma in a growing stem or root.

Plerophory noun [ Greek ...; ... full + ... to bear.] Fullness; full persuasion. "A plerophory of assurance." Bp. Hall.

Plesance noun Pleasance. [ Obsolete] Chaucer.

Plesh noun A pool; a plash. [ Obsolete] Spenser.

Plesimorphism noun [ Greek ... near + ... form.] (Crystallog.) The property possessed by some substances of crystallizing in closely similar forms while unlike in chemical composition.

Plesiomorphous adjective Nearly alike in form.

Plesiosaur noun (Paleon.) One of the Plesiosauria.

Plesiosauria noun plural [ New Latin See Plesiosaurus .] (Paleon.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia .

Plesiosaurian noun (Paleon.) A plesiosaur.

Plesiosaurus noun ; plural Plesiosauri . [ New Latin , from Gr ... near + ... a lizard.] (Paleon.) A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

Plessimeter noun See Pleximeter .

Plete transitive verb & i. To plead. [ Obsolete] P. Plowman.

Plethora noun [ New Latin , from Greek ..., from ... to be or become full. Confer Pleonasm .]
1. Overfullness; especially, excessive fullness of the blood vessels; repletion; that state of the blood vessels or of the system when the blood exceeds a healthy standard in quantity; hyperæmia; -- opposed to anæmia .

2. State of being overfull; excess; superabundance.

He labors under a plethora of wit and imagination.

Plethoretic adjective Plethoric. [ Obsolete] Johnson.

Plethoric adjective [ Greek ...; confer French 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.

Plethorical adjective Plethoric. [ R.] -- Ple*thor"ic*al*ly , adverb Burke.

Plethory noun Plethora. Jer. Taylor.

Plethron Pleth"rum noun ; plural Plethra . [ New Latin , from Greek ....] (Gr. Antiq.) A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.

Plethysmograph noun [ Greek ... 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 adjective

Plethysmography noun (Physiol.) The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply.

Pleura noun , plural of Pleuron .

Pleura noun ; plural Latin Pleuræ , English Pleuras . [ New Latin , noun fem. , from Greek ... 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. (Zoology) Same as Pleuron .

Pleural adjective (Anat.) Of or pertaining to the pleura or pleuræ, or to the sides of the thorax.

Pleuralgia noun [ New Latin , from Greek ... rib + ... pain.] (Medicine) Pain in the side or region of the ribs.

Pleurapophysis noun ; plural Pleurapophyses . [ New Latin 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 adjective Owen.

Pleurenchyma noun [ Greek ... side + ..., as in parenchyma .] (Botany) A tissue consisting of long and slender tubular cells, of which wood is mainly composed.

Pleuric adjective (Anat.) Pleural.

Pleurisy noun [ French pleurésie , Latin pleurisis , pleuritis , Gr pleyri^tis (sc. no`sos ), from pleyra` rib, side.] (Medicine) An inflammation of the pleura, usually accompanied with fever, pain, difficult respiration, and cough, and with exudation into the pleural cavity.

Pleurisy root . (Botany) (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 .

Pleurite noun (Zoology) Same as Pleuron .

Pleuritic, Pleuritical adjective [ Latin pleuriticus , Greek ...: confer French pleurétique .] (Medicine) (a) Of or pertaining to pleurisy; as, pleuritic symptoms. (b) Suffering from pleurisy.

Pleuritis noun [ Latin ] (Medicine) Pleurisy.

Pleuro- [ See Pleura .] A combining form denoting relation to a side ; specif., connection with , or situation in or near , the pleura ; as, pleuro peritoneum.

Pleurobrachia noun [ New Latin See Pleuro- , and Brachium .] (Zoology) A genus of ctenophores having an ovate body and two long plumose tentacles.

Pleurobranch noun [ See Pleuro- , and Branchia .] (Zoology) Any one of the gills of a crustacean that is attached to the side of the thorax.

Pleurobranchia noun ; plural Pleuroeranchiæ . [ New Latin ] (Zoology) Same as Pleurobranch .

Pleurocarp noun [ Pleuro- + Greek ... fruit.] (Botany) Any pleurocarpic moss.

Pleurocarpic, Pleurocarpous adjective (Botany) Side-fruited; -- said of those true mosses in which the pedicels or the capsules are from lateral archegonia; -- opposed to acrocarpous .

Pleurocentrum noun [ New Latin see Pleuro- , and Centrum .] (Anat.) One of the lateral elements in the centra of the vertebræ in some fossil batrachians.

Pleuroderes noun plural [ New Latin , from Greek ... the side + ... the neck.] (Zoology) 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.

Pleurodont adjective [ Pleuro- + Greek ..., ..., a tooth.] (Anat.) Having the teeth consolidated with the inner edge of the jaw, as in some lizards.

Pleurodont noun (Zoology) Any lizard having pleurodont teeth.

Pleurodynia noun [ New Latin , from Greek ... side + ... pain.] (Medicine) A painful affection of the side, simulating pleurisy, usually due to rheumatism.

Pleuron noun ; plural Pleura . [ New Latin , from Greek ... a rib.] (Zoology) (a) One of the sides of an animal. (b) One of the lateral pieces of a somite of an insect. (c) One of lateral processes of a somite of a crustacean.

Pleuronectoid adjective [ New Latin Pleuronectes , name of a genus (fr. Greek ... rib + ... a swimmer) + -oid .] (Zoology) Pertaining to the Pleuronectidæ , or Flounder family.

Pleuropericardial adjective (Anat.) Of or pertaining to the pleura and pericardium.

Pleuroperipneumony noun [ Pleuro- + peripneumony .] (Medicine) Pleuropneumonia.

Pleuroperitoneal adjective (Anat.) Of or pertaining to the pleural and peritoneal membranes or cavities, or to the pleuroperitoneum.

Pleuroperitoneum noun [ Pleuro- + peritoneum .] (Anat.) The pleural and peritoneal membranes, or the membrane lining the body cavity and covering the surface of the inclosed viscera; the peritoneum; -- used especially in the case of those animals in which the body cavity is not divided.

» Peritoneum is now often used in the sense of pleuroperitoneum , the pleuræ being regarded as a part of the peritoneum, when the body cavity is undivided.