PON 



335 



FOR 



tion of the 'hepatic substance' 

 which often partially bridges 

 over the 'umbilical fissure' of the 

 liver : p. Tarini, tdr-ln'-i (after 

 Tarin), the bridge of Tarin ; a 

 greyish matter connecting to- 

 gether the diverging 'crura 

 cerebri ' : p. Varolii, vdr-ol'-i-i 

 (after Varolius), the bridge of 

 Varolius ; an eminence of trans- 

 verse fibres, above and in front 

 of the 'medulla oblongata,' and 

 between the lateral lobes of the 

 cerebellum. 



Pontederacese, n. plu., pdnt'e'-der- 

 d'se^e (after Pontedera, professor 

 of botany at Padua), the Ponte- 

 deria family, an Order of aquatic 

 or marsh plants : Pontederia, n. , 

 pont'&'der'-i-ti, a genus of aquatic 

 plants. 



popliteal, a., pdp'ttt-etal, also 

 pop-tit'-e'til (L. poples, the ham 

 of the knee, poplitis, of the ham 

 of the knee), in anat., pert, to 

 the ham or back part of the knee- 

 joint : popliteus, a., pfrp'-ltt-ef-us, 

 applied to an oblique muscle 

 placed below the knee, arising 

 by a thick tendon from the fore- 

 part of the popliteal groove. 



poppy, n.,p$p'.pi (AS. popig, L. 

 papaver, the poppy), a gay 

 flowering plant of several species, 

 some of which yield opium ; the 

 ' Papaver somniferum,' Ord. 

 Papaveracese, is the opium 

 poppy. 



Populus, n., pop'-ul-tis (L. pop- 

 ttlus, a poplar tree), a genus of 

 trees called Poplars, Ord. Salic- 

 acese : Populus alba, alb'-a (L. 

 albus, white), the Abele or White 

 Poplar tree : P. tremula, tr%m'- 

 ul'd (L. trZmulus, quivering, 

 shaking), the Aspen : P. fastigi- 

 a,t&,fdst-idf>i.dtd (L. fdstigidtus, 

 pointed at the top from fast- 



rum, a projecting point), and 

 dilatata, dil'-dt-dt'-a (L. dilat- 

 dtus, spread out, enlarged from 

 dlldto, I spread out), are species 

 which are called the Lombardy 



Poplars : P. nigra, nlg'-rd (L. 

 ntger, black), and P. balsam- 

 ifera, bdl'sdm-if'&r-d (L. bal- 

 sdrmim, balsam ; fero, I bear), 

 are species whose buds, covered 

 with a resinous exudation, called 

 Tacamahac, are said to be 

 diuretic and antiscorbutic ; Pop- 

 lars secrete a saccharine substance 

 called ' Populine. ' 



pore, n.,pdr (Gr. poros, L. porus, 

 a passage or channel), a very 

 minute opening or interstice, as 

 in the skin : poriforai, a., por'-i- 

 form (L. forma, shape), resem- 

 bling a pore : porifera, n. plu., 

 pdr'if'$r-a (L.fero, I bear), the 

 Foraminifera or Sponges, from 

 their numerous openings or pores : 

 pore - capsules, in hot., dry 

 dehiscent capsules, splitting by 

 the detachment of small valves 

 from the pericarp, as in Papaver : 

 porous vessels, in bot., pitted or 

 dotted vessels. 



porrect, a. , por-rokt,' (L. porrectum, 

 to reach out or extend), in bot., 

 extended forward, as to meet 

 something. 



porrigo, n., pdr'rig'-d (L. porrlgo, 

 the scurf), formerly applied to 

 any affection of the head where 

 there were scabs. 



porta, n., ported (L. porta, a gate), 

 in the liver the transverse fissure 

 where the 'vena portse' divides 

 into two principal branches : 

 portal, a., port'-dl, pert, to the 

 system of the 'vena portse' of 

 the liver : portal vein, the vein 

 which receives the venous blood 

 on its way from the stomach, 

 spleen, and intestines, carrying 

 the blood on to the liver to be 

 distributed through that organ. 



portio dura, por'shi-6 dur-d (L. 

 portid, a portion ; durtis, hard), 

 the facial nerve, is the hard 

 portion of the seventh pair of 

 cranial nerves, and forms the 

 ' motor nerve ' of all the muscles 

 of expression in the face : portio 

 mollis, mtil'lis (L. mdttis, soft), 



