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Pertaining to, or denoting, an acid (called also acetyl- propionic acid), C5H8O3, obtained by the action of dilute acids on various sugars (as levulose). [Written also lævulinic.]

An unsaturated hydrocarbon, C5H8, of the acetylene series. Same as Valerylene.

Pertaining to, or designating, an organic acid (called also propargylic acid) of the acetylene or tetrolic series, analogous to propionic acid, and obtained as a white crystalline substance.C3H2O2, CH.C.COOH

A liquid hydrocarbon, C10H18, of the acetylene series. It is produced artificially.

Of, pertaining to, or designating, an acid of the acetylene series, isologous with stearis acid, and obtained, as a white crystalline substance, from oleïc acid.

distillation of storax, by the decomposition of cinnamic acid, and by the condensation of acetylene, as a fragrant, aromatic, mobile liquid; -- called also phenyl ethylene, vinyl benzene, styrol, styrene, and cinnamene.

A compound obtained as a yellowish gray powder by the action of acetyl chloride or acetic anhydride or ordinary tannic acid. It is used as an intestinal astringent, and locally in rhinitis and pharyngitis.

led because once supposed to contain a peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.

Of, pertaining to, or designating, an acid, C3H3.CO2H, of the acetylene series, homologous with propiolic acid, obtained as a white crystalline substance.

A hydrocarbon, C14H10, related both to the acetylene and the aromatic series, and produced artificially as a white crystalline substance; -- called also diphenyl acetylene.

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.