a. [f. Gr. καταχθόνιος subterranean, f. κατά down, under + χθόνιος of the ground, f. χθών ground + -IAN.] Subterranean.
1888. Rhys, Hibbert Lect., 131. Pluto … was always … a chthonian or catachthonian Zeus.
So Catachthonic a.
1884. Athenæum, 8 March, 314/3. In the Takashima coal-mine … an underground, or, as he prefers to call it, a catachthonic observatory.
