Parnassus, a mountain in Phocis, 10 m. N. of the Gulf of Corinth, 8000 ft. high, one of the chief seats of Apollo and the Muses, and an inspiring source of poetry and song, with the oracle of Delphi and the Castalian spring on its slopes; it was conceived of by the Greeks as in the centre of the earth.

Par*nas"sus (?), n. [L., fr. Gr. &?;.] (Anc. Geog. & Gr. Myth.) A mountain in Greece, sacred to Apollo and the Muses, and famous for a temple of Apollo and for the Castalian spring.

Grass of Parnassus. (Bot.)See under Grass, and Parnassia. -- To climb Parnassus, to write poetry. [Colloq.]