Parnassus \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.]