PLA 



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PLE 



plasma, n. , plaz'ma (Gr. plasma, 

 a thing moulded or formed, a 

 model), the colourless fluid part 

 of the blood in which the cor- 

 puscles float ; liquor sanguinis. 



pi asmodium, n. , plds mod'-i- urn 

 (Gr. plasma, a thing moulded or 

 formed ; eidos, resemblance), in 

 hot., a membranous protoplasmic 

 body, formed by the coalescence 

 of swarm spores in myxosporous 

 Fungi. 



plastic, a., plast'ik (Gr. plastikos, 

 suitable for being fashioned or 

 formed from plasso, I form or 

 mould), having power to give 

 form to matter : plastic element, 

 an element which contains the 

 germ of a higher form : plastic 

 force, the force which gives to 

 matter a definite organic form. 



plastron, n., plast'-rtin (Gr. em- 

 plastron, a plaster ; F. plastron, 

 a breastplate), that part of the 

 bony covering of turtles and 

 tortoises, etc., which covers the 

 lower or ventral portion. 



Platanaceas, n. plu.,/a'a?i-a'sg-e 

 (Gr. platanos, L. pldtdnus, the 

 plane tree from Gr. platus, 

 wide, broad), the Plane family, 

 an Order of trees so named from 

 their wide-spreading branches : 

 Platanus, n., pldt r -an>us, a genus 

 of plane trees : Platanus orient- 

 alls, dr'i-ent-dl'is (L. orientdlis, 

 eastern), the Oriental plane, 

 having broad palmate leaves like 

 the sycamore : P. occidentalis, 

 d&si'dent-dl'is (L. occidentdlis, 

 western), and P. acerifolia, as'- 

 ^'f'i'fol r -i'd (L. ace?-, the maple 

 tree ; folium, a leaf), are cultiv- 

 ated as showy trees under the 

 name of Planes. 



Platyelmia, n. plu., plat'-i-Wmi-a, 

 (Gr. platus, broad ; helmins, an 

 intestinal worm), the division of 

 the Scolecida, comprising the 

 Tapeworms. 



Platylobeaa, n. plu., plaf.i-ldb'.t-e 

 (Gr. platus, broad ; lobos, a lobe), 

 in bot., a general name for the 



tribes Pleurorhizeae and Noto- 

 rhizeae, meaning that the cotyled- 

 ons are plane or flat : platy- 

 phyllous, a., plat'-i-fil'-us (Gr. 



phullon 9 a leaf), in bot., broad- 

 leaved. 



Platyrhina, n. plu., plat'-i-rin'a 

 (Gr. platus, broad ; rhines, 

 nostrils), a group of the Quad- 

 rumana : platyrhine, a., plat'- 

 i>rin, broad-nosed ; applied to 

 the new-world monkeys, which 

 have their nostrils separated from 

 each other by a broad septum. 



platysma myoides, pldt-is'mti mi- 

 oyd'-ez (Gr. platusmos, enlarge- 

 ment ; mus, a muscle ; eidos, re- 

 semblance), a pale-coloured, thin 

 sheet of muscular fibres, extend- 

 ing over the front and sides of 

 the neck, and lower portions of 

 the side part of the face, which 

 assists in drawing the angle of 

 the mouth downwards and out- 

 wards ; it is the sole remains in 

 man of the ' muscular pannicul- 

 osus, ' or skin muscle, of animals. 



Plectranthus, n., pttlc-tranth'-us 

 (Gr. plektron, a cock's spur ; 

 anthos, a flower), a genus of 

 plants, Ord. Labiatae, so named' 

 in reference to the shape of the 

 flowers: Plectranthus graveolens, 

 grav-e'-dl-enz (L. gravetilens, 

 strong - smelling), the Patchouli 

 plant of the East Indies, used as 

 a perfume, and yields a volatile 

 oil of a yellowish-green colour. 



pleiomazia, n., pli'-d-mdzh'-i-a (Gr. 

 pleion, more ; mdzds, the breast), 

 an excess in the number of 

 mammas, rarely observed in men, 

 more commonly in women. 



pleiomorphy, n., pli'd-mtirf-f (Gr. 

 pleion, more ; morphe, shape), 

 in bot., the renewed growths in 

 arrested parts of irregular flowers; 

 pleiotaxy, n., pli'-o-taks'-l (Gr. 

 taxis, arrangement), the multi- 

 plication of whorls: pleiotrachese, 

 n. ylu.,pli'.o-trdk'-e-e(GT:.tracheia, 

 the windpipe ; trachus, rough), 

 numerous fibres united togethe^ 



