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

A gaseous hydrocarbon, C3H6, isomeric with propylene and obtained from it indirectly. It is the base of a series of compounds analogous to the aromatic hydrocarbons.

Propylene. [R.]

See 2d Tiler.

Pertaining to, or designating, an acid C11H20O2, homologous with acrylic acid, and obtained as a white crystalline substance by the distillation of castor oil.

A styliform process forming the posterior extremity of the vertebral column in some fishes and amphibians.

A liquid hydrocarbon, C5H8; -- called also pentine.

A volatile liquid hydrocarbon, C5H6, related to ethylene and acetylene, but possessing the property of unsaturation in the third degree. It is the only known member of a distinct series of compounds. It has a garlic odor.

Having no road or path; pathless.

See Welaway. [Obs.]

To wail. [Obs.] Chaucer.

See Welaway. [Obs.]

A liquid hydrocarbon of the terpene series extracted from the seeds of a Japanese prickly ash (Xanthoxylum pipertium) as an aromatic oil.

That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloëm.

lammable liquids, C6H4.(CH3)2, being dimethyl benzenes, and are called respectively orthoxylene, metaxylene, and paraxylene. Called also xylol.

Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH.

Pertaining to, or designating, a complex acid related to mesitylenic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol.

Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol.

Any zygodactylous bird.

In church or chapel style; -- said of compositions sung in the old church style, without instrumental accompaniment; as, a mass a capella, i. e., a mass purely vocal.