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GLOSSARY. 



plants allied to the coniferous 

 order. 



Pin'na (Lat. a fin or wing). In 

 anatomy, the part of the external 

 ear which projects beyond the 

 head ; in botany, a division of a 

 pinnate leaf. 



Pin'nate (Lat. pin'na, a feather). 

 Like a feather ; in botany, applied 

 to leaves which have a series of 

 leaflets on each side of the petiole. 

 Pinnat'ifid (Lat. pin'na, a feather ; 

 fin' do, I cleave). In botany, ap- 

 plied to leaves which are irregularly 

 divided, to about the midrib, into 

 segments or lobes. 



Pinna tipar'tite (Lat. pin'na, a feather; 

 par'tio, I divide). In botany, ap- 

 plied to leaves cut into lateral 

 segments nearly to the central rib. 

 Pinnat'iped (Lat. pin'na, a feather ; 

 pes, a foot). Having the toes 

 bordered by membranes. 

 Pis'ces (Lat. pis'ds, a fish). Fishes : 

 a class of oviparous vertebrate ani- 

 mals, inhabiting the water, breath- 

 ing by gills, having a heart with two 

 cavities, and the body generally 

 covered with scales. 

 Pis' cine (Lat. pis'ds, a fish). Rela- 

 ting to fish. 



Piscivorous (Lat. pis'ds, a fish ; 



vo'ro, I devour). Living on fishes. 



Pi'sifonn(Lat. pi' sum, a pea; for'ma, 



sli ape). Resembling a pea. 



Pi'solite (Lat. pi sum, a pea ; Or. \i6os, 



lith'os, a stone). A mineral called 



peastone, consisting of carbonate of 



lime with a little oxide of iron, 



occurring in small globular masses. 



Pis'til (Lat. pistil'lum, a pestle). In 



botany, the central organ of a 



flowering plant, consisting of the 



ovary, style, and stigma. 



Pistil'lary (Lat. pistil' turn, a pistil). 



Belonging to a pistil. 

 Pistillate (Lat. pistil'lum, a pistil). 



Bearing pistils. 



Pistillid'ium (Lat. pistil'lum, a pis- 

 til). An organ in cryptogamic or 

 flowerless plants, supposed to be 

 the analogue of the pistil. 

 Pistilliferous (Lat. pistil'lum, a pistil ; 



fer'o, I bear). Producing pistils. 

 Pis'ton (Lat. pin'so, I pound). A short 



cylinder fitting exactly into a tube, 

 and used for the purpose of forcing 

 air or fluid into or out of the latter. 



Pitch'stone. A rocky compound of 

 silica and alumina, having a com- 

 pact texture and a pitchy glassy 

 lustre. 



Pitu/itary (Lat. pitui'ta, phlegm). 

 Secreting phlegm or mucus ; ap- 

 plied especially to the membrane 

 lining the nose : also to a small 

 oval body at the base of the brain, 

 formerly supposed to secrete the 

 mucus of the nostrils. 



Pitu'itous (Lat. pitui'ta, phlegm or 

 mucus). Consisting of, or resem- 

 bling mucus. 



Pityri'asis (Gr. im-vpov, pit'uron, 

 bran). A disease of the skin, 

 characterised by the appearance of 

 patches of bran-like scales. 



Placen'ta (Gr. ir\a.Kovs, plalcous, a 

 flat cake). In anatomy, the mass 

 or cake, consisting principally of 

 blood-vessels, by which a connection 

 is maintained between the mother 

 and the foetus ; in botany, that 

 part of a seed-vessel or fruit to 

 which the ovules or seeds are 

 attached. 



Placen'tal (Placenta). Belonging to 

 the placenta. 



Placenta'tion (Placenta). The func- 

 tion .and arrangement of the 

 placenta. 



Placentiferous (Lat. placenta; fer'o, 

 I bear). Bearing a placenta. 



Placogan'oid (Gr. ir\a, plax, a flat 

 thing ; 701/0 s, gan'os, splendour ; 

 elSos, eidos, form). A suborder 

 of fossil fishes, covered with large 

 ganoid plates. 



Pla'coid (Gr. ir\a, plax, a flat thing ; 

 dSos, eidos, form). A term ap- 

 plied to an order of fishes, having 

 the body covered with irregular 

 plates of enamel. 



Plag'iostome (Gr. ir\ayios, pla(/ios, 

 oblique ; <TTo/j.a, stom'a, a mouth). 

 Oblique-mouthed ; applied to cer- 

 tain fossil obliquely compressed 

 oval bivalve mollusca ; also to an 

 order of fishes. 



Plane (Lat. planus, flat). A level 

 surface, such that a straight line, 



