1872, trademark for an ointment made from petroleum and marketed by Chesebrough Manufacturing Co., coined from German Wasser "water" + Greek elaion "oil" + scientific-sounded ending -ine. Robert A. Chesebrough was of the opinion that petroleum was a product of the underground decomposition of water.
The name is of mixed origin, being derived from Wasser, water, and elaion [Greek in the original], oil (water-oil), and indicates the belief of the discoverer that petroleum, the mother of Vaseline, is produced by the agency of heat and pressure from the carbon of certain rocks, and the hydrogen of water. [The Monthly Review of Dental Surgery, February 1877]
one of an ancient people formerly inhabiting the Highlands of Scotland and other parts of the British Isles beyond the reach of the Romans, late 14c. (replacing Old English plural Peohtas), from Late Latin Picti (late 3c., probably a nickname given them by Roman soldiers), usually taken as derived from picti "painted," but probably ultimately from the Celtic name of the tribe, perhaps Pehta, Peihta, literally "the fighters" (compare Gaulish Pictavi, a different people, who gave the name to the French city of Poitiers). They painted and tattooed themselves, which may have suggested a Roman folk-etymology alteration of the name.
In Scottish folk-lore, the Pechts are often represented as a dark pygmy race, or an underground people; and sometimes identified with elves, brownies, or fairies. [OED]
Related: Pictish; Pictland.