If you're thinking of the term related to volcanoes, it's "Pelean".
Pelean refers to a type of volcanic eruption characterized by:
* Explosive eruptions with a high gas content and a thick, viscous magma.
* Formation of a tall, narrow column of hot ash and gas called a "nuée ardente" (glowing cloud).
* Pyroclastic flows which are fast-moving, dense currents of hot gas and volcanic debris.
The term comes from Mount Pelée, a volcano in Martinique that had a devastating eruption in 1902.