Vocabulary : Petrographic to Petroline

Petrographic : Alt. of Petrographical
Petrographical : Pertaining to petrography.
Petrography : The art of writing on stone. ;; The scientific description of rocks; that department of science which investigates the constitution of rocks; petrology.
Petrohyoid : Pertaining to petrous, oe periotic, portion of the skull and the hyoid arch; as, the petrohyoid muscles of the frog.
Petrol : Petroleum.

Petrolatum : 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 materials in ointments.
Petroleum : Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the methane series, but may vary much in appearance, composition, and properties. It is refined by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc.
Petroleur : Alt. of Petroleuse
Petroleuse : One who makes use of petroleum for incendiary purposes.
Petroline : A paraffin obtained from petroleum from Rangoon in India, and practically identical with ordinary paraffin.

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