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g back, surrounds the viscera, forming a closed, or nearly closed, sac. [Written also peritonæum.]

Inflammation of the peritoneum.

See Perpender.

See Perpender.

See Packfong.

A handsome American butterfly (Euphydryas, or Melitæa, Phaëton). The upper side of the wings is black, with orange-red spots and marginal crescents, and several rows of cream-colored spots; -- called also Baltimore.

Pythoness; witch. [Obs.]

The hypothetical principle of fire, or inflammability, regarded by Stahl as a chemical element.

A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.

A motile condition in plants resulting from exposure to light. -- Pho`to*ton"ic, a.

One of the parts which by their repetition make up a flowering plant, each being a single joint of a stem with its leaf or leaves; a phytomer.

The science of the origin and growth of plants.

A kind of clay slate, carved by the Indians into tobacco pipes. Cf. Catlinite.

n from the steam, and in pumps to transmit motion to a fluid; also for other purposes. Piston head (Steam Eng.), that part of a piston which is made fast to the piston rod. -- Piston rod, a rod by which a piston is moved, or by which it communicates motion. -- Piston valve (Steam Eng.), a slide valve, consisting of a…

A spring packing ring, or any of several such rings, for a piston.

An igneous rock of semiglassy nature, having a luster like pitch.

s, taken collectively, which live at or near the surface of salt or fresh waters. --Plank*ton"ic (#), a.

A follower of Plato; a Platonist.

Pure, passionless; nonsexual; philosophical. Platonic bodies, the five regular geometrical solids; namely, the tetrahedron, hexahedron or cube, octahedron, dodecahedron, and icosahedron. -- Platonic love, a pure, spiritual affection, subsisting between persons of opposite sex, unmixed with carnal desires, and regardin…

In a Platonic manner.