[Acoustics], the science of sound as it affects the ear, specially of the laws to be observed in the construction of halls so that people may distinctly hear in them.
[Acrasia], an impersonation in Spenser's "Faërie Queen," of intemperance in the guise of a beautiful sorceress.
[Acre, St. Jean d'] (7), a strong place and seaport in Syria, at the foot of Mount Carmel, taken, at an enormous sacrifice of life, by Philip Augustus and Richard Coeur de Lion in 1191, held out against Bonaparte in 1799; its ancient name Ptolemaïs.
[Acres, Bob], a coward in the "Rivals" whose "courage always oozed out at his finger ends."
[Acroamatics], esoteric lectures, i. e. lectures to the initiated.
[Acrolein], a light volatile limpid liquid obtained by the destructive distillation of fats.
[Acroliths], statues of which only the extremities are of stone.
[Acrop`olis], a fortified citadel commanding a city, and generally the nucleus of it, specially the rocky eminence dominating Athens.
[Acrote`ria], pedestals placed at the middle and the extremities of a pediment to support a statue or other ornament, or the statue or ornament itself.
[Acta diurna], a kind of gazette recording in a summary way daily events, established at Rome in 131 B.C., and rendered official by Cæsar in 50 B.C.