cryptorheic
Draining through invisible, subterranean outflows.
A reasonable deduction would be that under karst (cryptorheic) conditions no surface streams would exist and that we should not look for a "drowned" surface drainage pattern.
Pertaining to an unspecified or unidentified discharge or secretion.
obsolete
Where it comes from
From crypto- (prefix meaning ‘hidden’) + Ancient Greek ῥέω (rhéō, “to flow, gush, stream”) + -ic (suffix meaning ‘of or pertaining’ to forming adjectives).
Adapted from the Wiktionary entry cryptorheic (CC BY-SA 4.0).