PES´SULUS, _n._ Cross-bone of the syrinx; bony bar across lower end of
windpipe, at point of forking into the bronchi.
PETRO´SAL, _a._ (Used substantively.) Same as _petrous_.
PE´TROUS, _a._ Stony; hence, hard. The _petrous_ bone is an element of
the temporal bone.
PHA´LANX, _n._; pl. _phalan´ges_. Commonly any bone of a finger or toe.
Equivalent to internode or joint (not _articulation_). Properly in such
application lacking the singular number, _phalanges_ being the row or
series of the small digital bones, taken collectively. (120.)
PHARYNGE´AL, _a._ Pertaining to the pharynx.
PHAR´YNX, _n._ Back compartment of the mouth, leading directly into the
œsophagus.
PHREN´IC, _n._ Pertaining to the diaphragm.
PHYS´ICAL, _a._ Bodily; material. Opposed to _mental_ or _psychical_.
PHYSIOG´NOMY, _n._ Countenance, in respect to temper of mind; general
appearance, in respect to habits.
PHYSIOL´OGY, _n._ Science of animal or vegetable economy; science of
bodily functions, processes, operations. It is less comprehensive than
_biology_, or the science of life, as it takes account only of material
or physical, not psychical, offices.
PI´A MA´TER, _n._ Soft vascular membrane immediately investing the
brain.
PI´CINE, _a._ Woodpecker-like.
PICTU´RA, _n._ Pattern of coloring.
PIG´MENT, _n._ Coloring-matter.
PIL´EUS (also written _pileum_), _n._ The cap; top of head from base of
bill to nape. (30.)
PIN´EAL BODY, _n._ A small organ associated with the brain.
PIN´ION, _n._ Part of the wing beyond the wrist exclusive of the
feathers; usually the metacarpus and phalanges; the hand bone. Not
technically used synonymously with _quill_ or _wing_.
PIN´NATED, _a._ Having little wing-like tufts of feathers on the neck.
PIN´NIFORM, _a._ An epithet of the penguin’s wing; fin-like.
PISCIV´OROUS, _a._ Fish-eating.
PITU´ITARY, _a._ That secretes mucus. _Pituitary membrane_, the mucous
membrane of the nasal passages. _Pituitary gland_, a certain appendage
of the brain.
PLA´GA, _n._ Stripe of color.