Per i car' di um, a membranous bag surrounding the heart.
Per is so dac' tyl, ungulates with an odd number of toes.
Per' i to ne' um, a membrane that lines the body cavity.
Pha' lanx (pl. phalanges), one of the bones of the fingers or toes.
Phar' ynx, the region of the alimentary canal just back of the mouth cavity.
Pigment, a substance which gives color to an object.
Plan' ti grade, walking on the soles of the feet; flat-footed.
Pol' len bas ket, the flattened hairy tibia of the hind legs of honey bees, used for carrying pollen.
Pol' lin na tion, the transfer of pollen from the anther of a flower to the stigma.
Polyp, any radially symmetrical animal, but usually an individual in a connected colony.