any of various green-coloured oils, esp. (a) oil pressed from unripe olives; (b) U.S. regional = petroleum, n. (now rare); (c) = anthracene oil n. at…

An aromatic hydrocarbon discovered in coal tar, now called anthracene.

A colourless crystalline aromatic hydrocarbon obtained by the distillation of coal tar or crude oil and used in chemical manufacture. Formerly called…

= anthraquinone, n.

A solid hydrocarbon, C18H12, occurring in crystalline form in the highest boiling fractions of coal tar, and in other substances, variable in colour…

A deep blue substance contained in many essential oils, also called azulene.

A crystalline aromatic hydrocarbon found in coal tar and used in the manufacture of dyes and pesticides.

Each of six isomeric compounds, C10H6O2, notionally obtained by replacing two of the ≧CH groups of naphthalene by carbonyl groups; spec. (more fully…

a distillate containing anthracene and similar aromatic compounds; any of the components of such a liquid.

A liquid hydrocarbon, blue in colour, found in some volatile oils; = cerulein, n.

A crystalline aromatic hydrocarbon found in coal tar and tobacco smoke. Cf. acenaphthene, n.

An oily liquid obtained on elimination of a water molecule from α- or β-ionone.