USED IN NATURAL HISTORY. 



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POLT'GOIT. A figure having more 

 than four sides. 



POLYGO'XAL. fr. gr. polus, many; 

 gona, angle. Having many sides 

 and many angles. 



POLYGY'IHA. fr. gr. polus, many; 

 gune, pistil. Name of an order 

 of plants. 



POLY'GYNOUS. fr. gr. polus, many; 

 gune, a female. Applied to flow- 

 ers with an indefinite number of 

 pistils. 



POLYHE'DRAL. fr. gr. polus, many ; 

 edra, seat. Relating to a polyhe'- 

 dron, a geometrical figure, bound- 

 ed by many faces or planes. 



POLYMO'RPHA. Lat. fr. gr. polus, 

 many; morphe, form. Many- 

 shaped. A specific name. 



POLYO'DOIT. fr. gr. polus, many ; 

 odous, odontos, tooth. Name of a 

 kind of sturgeon. 



PO'LYP. fr. gr. polus, many ; pous, 

 foot. A radiated animal which has 

 a cylindrical or oval body, or sac, 

 with an opening at one extremity, 

 around which are long feelers. 



POLYP A'KIA, and POLYPI A'RIA. 

 Groups of polyps or animalcules 

 which form coral. 



POLYPA'RICM. The skeleton or 



frame-work formed by coral ani- 

 malcules. When this frame-work 

 is of a stony hardness it consti- 

 tutes coral. In fossils the polypa- 

 rium alone remains. 



POLYPE'TALE.E. fr. gr. polus, many ; 

 petalon, a petal. Name of a class 

 of plants. 



POLYPE'TALOUS. Having many pe- 

 tals. 



POLYPHTL'LOUS. Having many 



leaves; applied to the calyx. 



PO'LYPI. Lat. plur. of polypus. 



POLYP'JDOM. fr. gr. polupous, a po- 

 lyp ; dome, a fabric, or frame. The 

 calcareous structure produced by 

 the organic functions of the coral- 

 line polyps. 



PO'LYPUS. Lat. A polyp. 



POLYSE'PALOUS. Having many se- 



pals. 

 11 



3G 



PoLYSPE'RMOus.-Having many seeds. 



POLYTHA'LAMOCS. fr. gr. polus, ma- 

 ny ; thalamos. chamber. Having 

 many chambers. 



POME. An apple ; a form of fruit. 



POMERA'NUS. Lat. Relating or be- 

 longing to Pomerania, a province 

 of Prussia. 



PON'TICA. fr. lat. pontus, the sea. 

 Belonging or relating to the sea. 



PONTO'PHIDAN. fr. lat. pontus, the 

 sea. and Gr. ophis, a serpent. A 

 sea-serpent. 



POR'CATE. Marked with raised lon- 

 gitudinal lines. 



PORCELLA'NA. Lat. Porcelain. 



PORCEL'LUS. Lat. The dimin. of 

 porous, a hog. A pig. 



PORC-EPIC. Fr. A porcupine. 



POR'CUPIXE. fr. lat. porcus, a hog; 

 spicatus, from spica, a head of 

 wheat, a spine. An animal re- 

 sembling a hog, with the skir 

 armed with spines. 



PO'ROCS. Containing pores. 



PORPHYRI'TIC. Of the nature of 

 porphyry. 



POR'PHYROID. Resembling por- 

 phyry. 



PORPHYRY. fr. gr. porphura, purple. 

 Originally applied to a red rock 

 found in Egypt. A compact feld- 

 spathic rock containing dissemi- 

 nated crystals of feldspar; the 

 latter, when polished, forming 

 small angular spots, of a light co- 

 lour, thickly sprinkled over the 

 surface. The rock is of various 

 colours, dark green, red, blue, 

 black, &c. 



PORPOISE. fr. lat. porcus, a hog; 

 piscia, a fish. Hog-fish. An aqua- 

 tic mammal. 



PORRE'CTA. Lat. Extended. 



PORRE'CTED. Projecting. 



PORTA. Lat. A gate. The part of 

 the liver, where its vessels enter 

 as by a gate. The vena porta is a 

 vascular apparatus, which con 

 veys black blood to the liver. 



PORTLAND-BED. A name given by 

 geologists to the superior division 



