PER 



SH 



PES 



close the blood-vessels of the 

 brain and spinal cord ; also 

 called * lymph ' channels, from 

 their containing lymph. 



perivisceral, a., per'-i-vis^r-dl 

 (Gr. peri, round about; L. viscera, 

 the inwards), in zool. , applied to 

 the space surrounding the viscera. 



poronate, a., p$r'8n-dt (L. peron- 

 dtus, rough - booted), in bot., 

 thickly covered with woolly mat- 

 ter, becoming powdery or mealy 

 externally. 



peroneal, a., pZr'-tin'e'-al (Gr. 

 perdne, the fibula or small bone 

 of the leg), in anat>, belonging 

 to or lying near the fibula, as 

 certain muscles connecting it 

 with the foot. 



peroneus longus, per'*$n-e'<us long' 

 gus (Gr. pertine, the fibula or 

 small bone of the leg ; L. longus, 

 long), in anat., a muscle situated 

 at the upper part of the outer 

 side of the leg : peroneus brevis, 

 breves (L. brevis, short), a muscle 

 lying beneath the ' peroneus 

 longus, 'and is shorter and smaller 

 than it, both muscles extending 

 the foot upon the leg, and serving 

 to steady the leg upon the foot : 

 p. tertius, ter'-shi-us (L. tertms, 

 the third), the smallest and lowest 

 in attachment, passing from the 

 leg to the fifth metatarsal bone* 



Persea, n., pers'-Z-ti (L. Gr. per sea, 

 a sacred Egyptian tree), a genus 

 of ornamental trees, Ord. Laur- 

 acese : Persea gratissima, grdt- 

 is'-sim-a (L. grains, pleasing, 

 agreeable, gratissimus, most 

 pleasing), a species yielding a 

 pear - shaped, succulent fruit, 

 called Alligator pear, and con- 

 taining a fixed oil. 



persistent, a., per-sist'Znt (L. per, 

 through ; sisto, I stand), in 

 bot. t not falling off ; remaining 

 attached to the axis until the 

 part bearing it is matured. 



personate, a., per'-son-dt (L. per- 

 sona, a mask, a character), in 

 bot. 9 a form of monopetalous 



corolla, where the orifice of the 

 tube is closed by an inflated pro- 

 jection of the throat, the whole 

 resembling a gaping mask ; hav- 

 ing a fanciful resemblance to a 

 face. 



pertuse, a., per-tus' (L. pertusus, 

 perforated from per, through ; 

 tusm, beat), pierced irregularly ; 

 in bot., having slits or holes : 

 pertusate, a., per -turf at, pierced 

 at the apex. 



pertussis, n., per-tus'-is (L. per, 

 intensive prefix ; tussis, a cough), 

 hooping-cough. 



perula, n., per'ul-a t perulae, n. 

 plu., per'-ul-e, orpemles, p&r'-ulz 

 (L. perula, a little pocket), in 

 bot., the scales of the leaf-bud. 



Peruvian or Jesuits' bark, n., 

 p$r>6v f 'i-dn (of or from Peru], the 

 popular name for various species 

 of Cinchona, Ord* Kubiacese, 

 growing abundantly in Upper 

 Peril: see * Cinchonese.' 



pes accessorius, p'es ak'seS'Sdr'-i'tis 

 (L. pes, a foot; accessonus, acces- 

 sory or assistant from accessus, 

 an approach), a white eminence 

 or cerebral convolution placed 

 between the hippocampus major 

 and minor : pes anserinus, tins'* 

 $r'in'us (L. anserinus, pert, to a 

 goose), the goose's foot, forming 

 the temporo-facial, and the cerv- 

 ico -facial division of the facial 

 nerve, having numerous out- 

 spreading branches : p. hippo- 

 campi, hip'-po-Mmp'-i (Gr. hip- 

 poS) a horse ; kampto, I bend or 

 curve), a number of rounded 

 elevations with intervening de- 

 pressions at the lower extremity 

 of the lateral ventricle of the 

 brain, so called as presenting a 

 resemblance to the paw of an 

 animal. 



pessary, n., pts'sar-i, pessaries, 

 n. plu., pes'-sar-iz (It. pessario, 

 F. pessaire, L. pessum, Gr. pesson, 

 a pessary), supports or medica- 

 ments for intravaginal use. 



pestle, n., pest'-l or pes'-l (L. 



