I.underground, subterranean (class.): “specus,” Cic. Att. 15, 26, 4; cf.: “supterraneos specus aperire,” Tac. G. 16: “ergastulum,” Col. 1, 6, 3: “structura,” Plin. 36, 22, 50, § 170: “regna,” Juv. 2, 149: “animalia,” Pall. Sept. 3, 2: “mures,” Sen. Q. N. 3, 16, 3: “subterraneis venis in mare defluunt,” Plin. 9, 15, 20, § 53: “domus,” id. 36, 13, 19, § 88: “cubiculum,” Plin. Ep. 4, 11, 9: “subterraneis dolis peractum urbis excidium,” Flor. 1, 12 fin.—Subst.: sub-terrānĕum , i, n., a subterranean place: “in ipso subterraneo semirotundo,” App. M. 11, p. 260, 2.
sub-terrānĕus , a, um, adj. terra,