Definition of cryptovolcanic in English:

cryptovolcanic

Pronunciation /ˌkrɪptə(ʊ)vɒlˈkanɪk/

adjective

Geology
  • Of a phenomenon or structure (especially a crater): apparently volcanic but occurring or formed in the absence of evident volcanic activity.

    Many structures formerly so described have been shown to result from meteorite impact.

Origin

Early 20th century; earliest use found in Nature: a weekly journal of science. From crypto- + volcanic, after German kryptovulkanisch.