piliferous 
pisiform 
piliferous, -rus (pilus, a hair, fero, I 
bear), (1) bearing hairs, or tipped 
with them ; (2) hair-pointed vce 
ley) ; ~ Lay’er, the young superfi- 
cial tissue of roots, producing the 
root-hairs, when present ; pi’liform 
( forma, shape), applied to the point 
of a nerve in Mosses, when like a 
long flexuose hair; pilig’erous (gero, 
I bear), bearing hairs, 
Pill, Grew’s spelling of PEEL, 
pi'locar’pine, the active principle of 
Pilocarpus, a genus of Rutaceae. 
pil’o-glan’dulose (pilus, a hair), used 
by J. Smith for Ferns bearing 
glandular hairs ; pi’lose, pilo’sus, 
pi'lous, hairy, any kind of pilosity, 
usually meaning having soft and 
distinct hairs ; Pilos’ity, Pilos'itas, 
hairiness ;_ pilosius’culus (Lat.), 
slightly hairy ; Pi‘losism, abnormal 
hairiness in plants ; deform’ing ~, 
when in excess and completely dis- 
figuring the species ; physiolo- 
gical ~, occasioned by circum- 
stances, as growth in a dry soil; 
teratolog’ical ~, when it becomes a 
disease, cf, DEFORMING. 
Pil'ula ¢ (Lat., a globule), (1) a cone 
like a galbulus; (2) any spherical 
inflorescence. 
Pi’/lus (Lat.), a hair; cf. PILu. 
pim’pled, papillose. 
pin-eyed, a florist’s term for those 
flowers of dimorphic species, which 
have long styles, the stigma show- 
ing itself at the mouth of the 
corolla-tube. 
Pinakench’yma (rivat,a table, éyxuua, 
an infusion), the muriform tissue 
of medullary rays, whose com- 
ponent cells are tabular; Pinen- 
ch’yma is a shortened form. 
Pinch’ing-Bod‘ies, the Corpus :uLA of 
Asclepiads; the junction of the 
pollinia which clings to the leg of 
an insect visitor ; ~ Traps, another 
name for the same mechanism ; the 
German equivalents are Klemm- 
kérper and Klemmenfallen, 
Pine’'tum (Lat., a pine-grove), (1) a 
work devoted to Coniferae ; (2) a 
collection of the same in a garden. 
Pi’nite, a glucoside, sweet and cry- 
stalline, derived from Pinus Lam- 
bertiana, Doug]. 
Pin’na, pl. Pin’nae (Lat. a feather), a 
primary division of a pinnate leaf, 
its leaflets, which sometimes them- 
selves are pinnate, are restricted by 
Bower to the ‘“‘ branches of the first 
order borne upon the phyllopo- 
dium,” the axis of the leaf; pin’- 
nate, pinna‘tus, with leaflets ar- 
ranged along each side of a common 
petiole; ~ with an odd one=impari- 
pinnate ; pinna’tely, in a pinnate 
fashion, as ~ com’pound, ~ cleft, 
~ decom’pound, ~ divi'ded, ~ 
lo’bed, ~ par’ted, ~ ter’nate, ~ 
trifo'liolate, ~ veined; pinna’tifid, 
pinnatif'idus (findo, fidi, to cut), 
pinnately cleft ; pinnatilo’bate, 
pinnatiloba'tus, pinnatilo'bus (lobus, 
a lobe), pinnately lobed; pinnati- 
partite, pinnatiparti'tus, pinnately 
parted ; pinnatiscis’sus, (scissus, 
cleft), pinnately divided or cut; 
pinna’tisect, pinnatisec’tus (sectus, 
cut), pinnately divided down to the 
rhachis ; pin’niform ( forma, shape), 
like a feather ; pinniner’ved (nervus, 
a nerve), pinnately veined, the 
veins running parallel towards the 
margin ; pin’nulate, with pinnules ; 
Pin'nule, Pin'nula, pl. Pin'nulae,(1) 
a secondary pinna; (2)in Diatoms, 
thickened ribs on the valves, as in 
Pinnularia. 
pinoid (pinus, a pine, eldos, resem- 
blance), like a pine-needle. 
Pip, (1) the popular name for the 
seeds of an apple or pear ; (2) ‘‘small 
seeds or seed-like bodies including 
the bulbs of Lily of the Valley” 
(Crozier) ; (3) a florist’s term for a 
single flower of a truss. 
Pip’erin, the active principle of white 
and black pepper, Piper nigrum, 
Linn., a white crystalline body 
isomeric with morphive; pip’era- 
tus, piperi’tus (Lat., peppered), 
peppery, having a hot, biting 
taste. 
pi'siform, pisiform’is (pisum, a pea, 
Jorma, shape), pea-shaped. 
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