W. Whewell's suggested name for: the earliest epoch of the Tertiary period, the Palaeocene.

The name was not adopted by Lyell, who did, however, use Whewell's terms Eocene, Miocene, and Pliocene.

Any of the series of compounds with a molecule consisting of a line of fused benzene rings.

The simplest such compounds are "naphthalene" (two rings) and "anthracene" (three rings).