| petrography | 1. The art of writing on stone. 2. The scientific description of rocks; that department of science which investigates the constitution of rocks; petrology. Origin: Petro. Source: Websters Dictionary (01 Mar 1998) |
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| petrohyoid | <anatomy> Pertaining to petrous, oe periotic, portion of the skull and the hyoid arch; as, the petrohyoid muscles of the frog. Origin: Petro + hyoid. Source: Websters Dictionary (01 Mar 1998) |
| petrolatum | <pharmacology> A semisolid unctuous substance, neutral, and without taste or odour, 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. Petrolatum is the official name for the purified product. Cosmoline and vaseline are commercial names for substances essentially the same, but differing slightly in appearance and consistency or fusibility. Source: Websters Dictionary (01 Mar 1998) |
| 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. Petroleum spirit, a volatile liquid obtained in the distillation of crude petroleum at a temperature of 170 deg Fahr, or below. The term is rather loosely applied to a considerable range of products, including benzine and ligroin. The terms petroleum ether, and naphtha, are sometimes applied to the still more volatile products, including rhigolene, gasoline, cymogene, etc. Origin: NL, fr. L. Petra a rock + oleum oil: cf. F. Petrole. Cf. Petrify, and Oil. Source: Websters Dictionary (01 Mar 1998) |
| petroleum ether | petroleum benzin |
| petroleum jelly | <pharmacology> A semisolid unctuous substance, neutral, and without taste or odour, 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. Petrolatum is the official name for the purified product. Cosmoline and vaseline are commercial names for substances essentially the same, but differing slightly in appearance and consistency or fusibility. Source: Websters Dictionary (01 Mar 1998) |
| petroline | <chemistry> A paraffin obtained from petroleum from Rangoon in India, and practically identical with ordinary paraffin. Source: Websters Dictionary (01 Mar 1998) |
| petrological | Of or pertaining to petrology. Source: Websters Dictionary (01 Mar 1998) |
| petrologically | According to petrology. Source: Websters Dictionary (01 Mar 1998) |
| petrologist | One who is versed in petrology. Source: Websters Dictionary (01 Mar 1998) |
| petrology | 1. <study> The department of science which is concerned with the mineralogical and chemical composition of rocks, and with their classification: lithology. 2. A treatise on petrology. (04 Mar 1998) |
| petromastoid | <anatomy> Of or pertaining to the petrous and mastoid parts of the temporal bone, periotic. Origin: Petro + mastoid. Source: Websters Dictionary (01 Mar 1998) |
| Petromyzon | Primitive marine vertebrate (Class Agnatha) with eel like body and lacking true jaws. Their relatively simple nervous system has been studied in some detail. (18 Nov 1997) |
| petromyzont | <zoology> A lamprey. Origin: Petro + Gr. To suck in. Source: Websters Dictionary (01 Mar 1998) |
| petropharyngeus | See: musculus petropharyngeus. (05 Mar 2000) |