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extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales.

intermediate between gsolene and cymogene. It is obtained in the purification of crude petroleum, and is used as a refregerant.

r Agaric. -- Rock moss, a kind of lichen; the cudbear. See Cudbear. -- Rock oil. See Petroleum. -- Rock parrakeet (Zoöl.), a small Australian parrakeet (Euphema petrophila), which nests in holes among the rocks of high cliffs. Its general color is yellowish olive green; a frontal band and the outer edge of the wing…

or resembling, fat; specifically, designating an acid (formerly called also sebic, and pyroleic, acid), obtained by the distillation or saponification of certain oils (as castor oil) as a white crystalline substance.

lk, from which results unequal segmentation. See Holoblastic, Meroblastic, Alecithal, Centrolecithal, Ectolecithal, and Ovum. -- Segmentation sphere (Biol.), the blastosphere, or morula. See Morula.

e of the Five Nations. Seneca grass(Bot.), holy grass. See under Holy. -- Seneca eil, petroleum or naphtha. -- Seneca root, or Seneca snakeroot (Bot.), the rootstock of an American species of milkworth (Polygala Senega) having an aromatic but bitter taste. It is often used medicinally as an expectorant and diuretic,…

Impure dark-colored sulphuric acid that has been used in the refining of petroleum.

oxidized that it combines violently with water, and to be preserved must be kept under petroleum or some similar liquid. Sodium is used combined in many salts, in the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). A…

A california market fish (Pogonichthys macrolepidotus) belonging to the Carp family.

n action; as, to strike off what is superfluous or corrupt. -- To strike oil, to find petroleum when boring for it; figuratively, to make a lucky hit financially. [Slang, U.S.] -- To strike one luck, to shake hands with one and wish good luck. [Obs.] Beau. & Fl. -- To strike out. (a) To produce by collision; to force…

See Styrolene.

A hypothetical radical found in certain derivatives of styrolene and cinnamic acid; -- called also cinnyl, or cinnamyl.

troglycerin. It is also used in etching iron, in removing iron scale from forgings, in petroleum refining, etc., and in general its manufacture is the most important and fundamental of all the chemical industries. Formerly called vitriolic acid, and now popularly vitriol, and oil of vitriol. -- Fuming sulphuric acid,…

drocarbon, C13H28, of the methane series, which is a probable ingredient both of crude petroleum and of kerosene, and is produced artificially as a light colorless liquid.

, C13H26, of the ethylene series, corresponding to tridecane, and obtained from Burmah petroleum as a light colorless liquid; -- called also tridecylene, and tridecene.

A liquid hydrocarbon, C11H24, of the methane series, found in petroleum; -- so called from its containing eleven carbon atoms in the molecule.

The acorn cup of two kinds of oak (Quercus macrolepis, and Q. vallonea) found in Eastern Europe. It contains abundance of tannin, and is much used by tanners and dyers.

nce, almost odorless and tasteless, obtained as a residue in the purification of crude petroleum, and consisting essentially of a mixture of several of the higher members of the paraffin series. It is used as an unguent, and for various purposes in the arts. See the Note under Petrolatum. [Written also vaselin.]…

. -- White sucker. (Zoöl.) (a) The common sucker. (b) The common red horse (Moxostoma macrolepidotum). -- White swelling (Med.), a chronic swelling of the knee, produced by a strumous inflammation of the synovial membranes of the kneejoint and of the cancellar texture of the end of the bone forming the kneejoint; --…

To sing in a manner common among the Swiss and Tyrolese mountaineers, by suddenly changing from the head voice, or falsetto, to the chest voice, and the contrary; to warble.