Osteologist, one versed in the nature, arrangement, and uses of the bones.
Oxide, a compound of oxygen, and a base destitute of acid and saltish properties.
Pachyderm, a non-ruminant animal, characterized by the thickness of its skin.
Palæolithic, the ancient stone age; a term applied to the earliest traces of man when he was cotemporary with many extinct mammalia.
Palæontological, belonging to the science of the ancient life of the earth.
Parallelogram, a figure having four sides, the opposite sides of which are parallel, and consequently equal.
Parietal, pertaining to the bones which form the sides and upper part of the skull.
Pathological, pertaining to the knowledge of disease.
Pelvic, pertaining to the open, bony structure at the lower extremity of the body.
Perihelion, that point in the orbit of a planet, or comet, in which it is nearest to the sun.