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Any Australian kangaroo of the genus Petrogale, as the rock wallaby (P. penicillata).

Of or pertaining to petroglyphy.

The art or operation of carving figures or inscriptions on rock or stone.

Pertaining to petrography.

iption of rocks; that department of science which investigates the constitution of rocks; petrology.

Pertaining to petrous, oe periotic, portion of the skull and the hyoid arch; as, the petrohyoid muscles of the frog.

Petroleum. [R.]

A semisolid unctuous substance, neutral, and without taste or odor, derived from petroleum by distilling off the lighter portions and purifying the residue. It is a yellowish, fatlike mass, transparent in thin layers, and somewhat fluorescent. It is used as a bland protective dressing, and as a substitute for fatty mat…

ned by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc. Petroleum spirit, a volatile liquid obtained in the distillation of crude petroleum at a temperature of 170° Fahr., or below. The term is rather loosely applied to a considerable range of products, including benzine and ligroin. T…

One who makes use of petroleum for incendiary purposes.

A paraffin obtained from petroleum from Rangoon in India, and practically identical with ordinary paraffin.

Of or pertaining to petrology.

According to petrology.

One who is versed in petrology.

A treatise on petrology.

Of or pertaining to the petrous and mastoid parts of the temporal bone, periotic.

A lamprey.

A sort of hand cannon, or portable firearm, used in France in the 15th century.

Hard; stony; petrous; as, the petrosal bone; petrosal part of the temporal bone.

Felsite.