PIG- 



241 



PIN 



[L. pia mater, kind mother.] A 

 delicate highly vascular membrane 

 investing brain and spinal cord 

 (anat.). 



pigment (pig'me'nt) n. [L. pingere, 

 to paint.] Colouring matter in 

 plants or animals. 



pigment cell, a chromatophore or 

 cell containing colouring matter 

 (dto!.). 



pigmentation (plg'me'nta'shun) n. [L. 

 pingere, to paint.] Disposition of 

 colouring matter in an organ or 

 organism (dio!.). 



pileate i (pll'ea'te'd) a. [L. pileus, a felt 

 cap.] Crested ; appl. Birds (zoo!.). 



pileolated (pil'eola'tgd) a. [L. pileolus, 

 a small cap.] Furnished with a 

 small cap or caps. 



pileolus (plle'olus) n. [L. pileolus, a 

 small cap.] A small pileus. 



pileorhiza (pll'eori'za) n. [L. pileus, 

 a cap ; Gk. rhiza, root.] A root- 

 covering ; a root-cap (dot.). 



pileum (pil'eum) n. [L. pileum, a 

 cap.] The top of the head region 

 of a bird. 



pileus (pll'eus) n. [L. pileus, a felt 

 cap.] The umbrella-shaped struc- 

 ture of a mushroom (dot.), or of a 

 jelly-fish (zoo/.). 



pilidium (pllid'ium) n. [Gk. pilidion, 

 a small cap.] The characteristic 

 helmet-shaped larva of Nemertines 

 (zoo!.). 



pilifer (pil'Ifgr) n. [L. pilus, hair ; 

 ferre, to carry.] Part of the labrum 

 of Lepidoptera (zoo!.). 



piliferous (pilif'grus) a. [L. pilus, 

 hair ; ferre, to carry.] Bearing or 

 producing hair (dto!.) ; appl. the 

 outermost layer of a root or epi- 

 blema which gives rise to root- 

 hairs (oof.). 



pilose (pflos) a. [L. pilus, hair.] 

 Hairy. 



pilus (pl'lus). [L. fli/us, hair.] One 

 of slender hair - like structures 

 covering some plants (oof.). 



pinacocytes (pin'akoslts) n. plu. [Gk. 

 pinax, a tablet ; kytos, hollow.] 

 The flattened plate-like cells of the 

 dermal epithelium of Sponges 

 (zoo!.). 



pincers, prehensile claws, as of 

 lobster ; chelae of Insects ; cheli- 

 cerae of Arachnids (zoo!.). 



pinealis (pine'alls) n. [L. pinea, a 

 pine-cone.] An upgrowth from the 

 roof of the midbrain of Vertebrates ; 

 the pineal body or gland or eye. 



pinna (pln'a) n. [L. pinna, a feather.] 

 A leaflet of a pinnate leaf (do/.) ; 

 the outer ear ; a bird's feather or 

 wing ; a fish-fin (zoo!.). 



pinnate (pin'at) a. [L. pinna, a 

 feather.] Divided in a feathery 

 manner; with lateral processes ; of 

 a compound leaf, having leaflets 

 on each side of an axis or midrib 

 (do/.). 



pinnatifld (pinat'ifid) a. [L. pinna, 

 feather ; findere, to cleave.] Appl. 

 leaves lobed about half-way to the 

 midrib (fot.). 



pinnatilobate (plnat'ilo'bat) a. [L. 

 pinna, feather ; Gk. lobos, a lobe.] 

 With leaves pinnately lobed (oof.). 



pinnation (plna'shun) n. [L. pinna, 

 feather.] Pinnate condition (boi.\ 



pinnatipartite (plnat'Ipar'tlt) a. [L. 

 pinna, feather ; partitus, divided.] 

 With leaves lobed three-quarters of 

 the way to the midrib (oof.). 



pinnatiped (pinat'ipgd) a. [L. pinna, 

 feather ; pes, foot.] Having lobed 

 feet, as certain Birds. 



pinnatisect (ptnat'isekt) a. [L. pinna, 

 feather ; sectus, cut.] With leaves 

 lobed almost down to the base or 

 midrib (dot.). 



pinnatodentate (plnat'odeVtat) a. [L. 

 pinna, feather ; dens, tooth.] Pin- 

 nate, with toothed lobes (dof.). 



pinnatopectinate (pfnat'opeVtlnat) a. 

 [L. pinna, feather ; pecten, a comb.] 

 Pinnate, with pectinate lobes (dof.). 



pinnlform (ptn'lform) a. [L. pinna, 

 feather; forma, shape.] Feather- 

 shaped or fin- shaped (dio!.). 



pinninervate (pln'IneVvat) a. [L. 

 pinna, feather ; nervus, a sinew.] 

 With veins disposed like parts of a 

 feather (dof.). 



pinnule (pln'ul) n. [L. pinna, feather.] 

 A secondary leaflet of a bipinnate 

 leaf (dot.) ; in Crinoids, one of the 

 side-branches, two rows of which 

 fringe the arms (zoo!.). 



pinulus (ptn'ulus) n. [L. pinulus, a 

 small fir.] A spicule resembling a 

 fir-tree owing to the development 

 of numerous small spines from one 

 radial ray (zool.\ 



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