PINENCHYMA 



1103 



PINNATILOBED 



gland of higher animals by the pineal stalk. It is 

 the vestige of what was a functionating sense-organ 

 in extinct reptiles (Labyrinthodonta), and perhaps in 

 mesozoic mammals (Tritylodon), or possibly an organ 

 for the perception of warmth; the pineal body, 

 epiphysis, or conarium, epiphysial eye, parietal eye, 



Section Through part of Head of Embryo 

 Lizard, showing so-called pineal eye. 

 P. Specialized isolated extremity of pineal diverticulum from 

 brain-vesicle (B). b.c So-called retinal and lenticular areas 

 of its walls, a. Ectoderm, d. Remains of diverticulum un- 

 dergoing division into tubules (ef). f. Blood-vessels, e. 

 Mesodermic tissue. (After Piersol.) 



third eye. P. Gland. See P. Body. P. Pedun- 

 cles, the habena or habenulce. P. Sand, the brain- 

 sand, often found in the pineal body. P. Ventricle, 

 the cavity occasionally found within the pineal body ; 

 it represents the persistence of a fetal condition. 



Pinenchyma pin-en' '-kirn- ah) [-'wai, tablet ; iyxvfia, 

 infusion]. Tissues composed of flat cells. 



Pinene (pi'-nen) [pinus, pine], C ]0 H ]6 . A hydrocar- 

 bon, the chief ingredient of the turpentine-oil prepared 

 from the different varieties of pine, of eucalyptus-oil, 

 juniper-berry oil, sage-oil, etc. 



Ping Ping. The root of a Chinese plant, used in ves- 

 ical affections. Unof. 



Pinguecula, Pinguicula ( pin-grvek' -u-lah, pin-grvih'- 

 u-lah) [pinguis. fat]. A small, yellow-white tumor 

 of the conjunctiva, situated between the cornea and 

 the canthus of the eye. 



Pinguefaction { pin - gwe -fak'- shun) [pinguis, fat; 

 facere, to make]. Conversion into fat. 



Pinguicula (pin-givik'- u-lah) [pinguis, fat]. I. A 

 genus of some thirty species of plants of wide geo- 

 graphic distribution ; the butterworts. They have 

 vulnerary and aperient properties, and are locally 

 used in thickening milk. They are insectivorous 

 plants, and contain one or more digestive ferments. 

 2. A small tumor of the conjunctiva. 



Pinguid i pingt-gvrid) [pinguis. fat]. Fat ; unctuous. 



Pinguidinous (pmg-gwid'-in-us) [pinguis, fat]. Con- 

 taining fat. 



Pinguitude { ping' -gwit-iid) [pinguis, fat]. Fatness. 



Pinguoleum ( ping-gwo'-le-um) [pinguis, fat; oleum, 

 oil]. A fatty or fixed oil. 



Pinhole {pin' -hoi ) [ME. , pinne, pin ; AS., hoi, a hole]. 

 A minute perforation, like that made by a pin. P. Os, 



an extreme degree of atresia of the os uteri, seen in 

 young and undeveloped women. P. Pupil, Pin-point 

 Pupil, contraction of the iris to an extent that the 

 pupil is scarcely larger than a pin's head. It is seen 

 in opium-poisoning, after the use of myotics, in certain 

 cerebral diseases, in locomotor ataxy, etc. 



Pinic Acid (pin' -ik)[ pinus, pine], C^H^O,. A resin- 

 ous body obtained from pine-resin, having the same 

 formula as pinearic acid, with which it may be ident- 

 ical. 



Pinicoline (pin-ik'-o-lin) [pinus, a pine-tree; colere, 

 to inhabit]. In biology, inhabiting pine forests, e.g., 

 the Capercally, or Cock-of-the-wood (Tetrao urogal- 

 lus). 



Piniform (pi'-niform) [pinus, pine; forma, form]. 

 Pine-shaped ; resembling a pine-cone. P. Decus- 

 sation, a decussation of fibers in the oblongata be- 

 tween the central gray matter and the pyramids. 



Pining (pi'-ning) [ME., pinen, pain]. Vulgar syno- 

 nym for tuberculosis of cattle. Also applied to a 

 peculiar melancholic longing of pregnant women, 

 commonly called " longings." 



Pinion (pin'-yun) [penna, pinna, wing, feather]. In 

 biology, the manus or distal segment of a bird's 

 wing (carpus, metacarpus, phalanges) bearing the pri- 

 mary remiges. 



Pinipicrin (pin-ip-ik'-rin) [pinus, pine; TziKpoc, bit- 

 ter], C^HjjgO,!. A bitter glucosid obtained from the 

 needles and the bark of Pinus sylvestris and other 

 plants. 



Pinitannic Acid (pin-it-an'-ik) [pinus, pine; ME., 

 tannen, tan], C u H 16 O g . A yellowish-red powder, a 

 variety of tannic acid, found in Pinus sylvestris and 

 other plants. 



Pinite (ptn'-it) [pinus, pine], C,H, 2 5 . A substance 

 that occurs in the resin of Pinus lambertina. It 

 melts at 150 C. It is a pentahydric phenol of hexa- 

 hydrobenzene. 



Pinites (pin-i'-tez) [pinus, pine]. A genus of extinct 

 coniferous trees, of which P. succinifer is thought 

 to have been the source of amber. 



Pink [pingk) [origin obscure]. A shade of pale-red. 

 P. Crystals. Same as P. Salt. P. -eye, the popu- 

 lar term for a contagious mucopurulent conjunctivitis 

 of horses, characterized by a red color of the eyeball. 

 It may occur in man. P. -madder. See Pigments, 

 Conspectus of. P. -root. See Spigelia. P. Salt. 

 See Pigments, Conspectus of 



Pinna (pin' -ah) [pinna, penna, feather, wing: //. , 

 Pinnce\. In biology, a name applied to various wing- 

 like or feather-like organs ; as a wing, feather, fin, 

 flipper, the ala auris or external cartilaginous flaps 

 of the ear, the ala of the nose, one of the primary divi- 

 sions of a pinnately-compound leaf. P. nasi. Syno- 

 nym of Ala nasi. 



Pinnadiform (pin-ad' -if orm) [pinna, feather, wing; 

 ad, to ; forma, form]. In biology, applied to certain 

 fishes in which the skin extends out on some or all of 

 the fins. 



Pinnaglobulin (pin-ah-glob'-u-lin) [irh>va, a kind of 

 mussel ; globulus, a round body]. A respiratory 

 pigment containing manganese found in the blood of 

 Pinna squamosa. 



Pinnate (pin' -at) [pinna, a feather]. In biology, 

 feathered or shaped like a feather. 



Pinnatifid (pin-at'-if-id) [pinna, a feather ; findere, 

 to cleave] In biology, cleft in a pinnate manner, with 

 the marginal divisions reaching at least half way to 

 the midrib ; pinnatisected. 



Pinnatilobate (pin-at-il-o'-bat). Same as Pinnati- 

 lobed. 



Pinnatilobed (pin-af -il-obd) [pinna, a feather; lobus, 



