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pseudo-volcano
pseudo-volcano n. 
/ˌsudoʊˌvɑlˈkeɪnoʊ/ now historical a hill or vent that emits smoke, flame, or gases, but not lava (e.g. above a coal mine that has accidentally caught fire).
Brit. /ˌs(j)uːdə(ʊ)vɒlˈkeɪnəʊ/
, /ˌs(j)uːdə(ʊ)vɒlˈkeɪnəʊ/U.S. /ˌsudoʊˌvɔlˈkeɪnoʊ/
, /ˌsudoʊˌvɔlˈkeɪnoʊ//ˌsudoʊˌvɑlˈkeɪnoʊ/ΘΚΠ
the world > the earth > land > landscape > high land > volcano > [noun]
Vulcan?a1425
volcan1577
volcano1613
furnace1660
volcanello1669
volcano mountain1693
pseudo-volcano1794
mud volcano1816
salse1831
stratovolcano1894
shield volcano1911
1794 R. Kirwan Elements Mineral. (ed. 2) I. 419 Pseudo-volcanos are so called, because, like volcanos, they emit smoke, and sometimes flame, but never lava... Most of these are coal mines which have accidentally taken fire.
1897 Science 1 Jan. 7/2 Nicollet..got authentic accounts of pseudo-volcanoes caused by the spontaneous combustion of bituminous material within the rocks.
1970 Proc. Amer. Philos. Soc. 114 51/1 The phenomenon was due to the melting of shale overlying coal beds which had been set on fire... These were the ‘pseudo-volcanoes’.
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