cryovolcanismn.
/ˌkrʌɪə(ʊ)ˈvɒlkənɪz(ə)m/, U.S. /ˌkraɪoʊˈvɔlkəˌnɪz(ə)m/, /ˌkraɪoʊˈvɑlkəˌnɪz(ə)m/ Astronomy.
Eruptive or intrusive processes analogous to volcanism occurring at low temperatures in the icy crusts of certain planets and satellites, typically involving liquid or gaseous water, methane, nitrogen, etc.
ΚΠ
1987 Abstr. with Programs (Geol. Soc. Amer.) 19 630/1 (title) Miranda: cryovolcanism and tectonism on a micro-planet.
1996 C. Frankel Volcanoes Solar Syst. ix. 194 These are the ices that fuel cryovolcanism and give birth to flows and icy sprays at the surface.
2006 Nature 8 June p. ix It has been possible to probe through the atmospheric haze [of Saturn's largest moon] and identify impact craters, cryo-volcanism,..and dark streaks that could be wind-induced dunes.
This is a new entry (OED Third Edition, June 2011; most recently modified version published online March 2022).
<
n.1987