la·har 
(lähär′)
(lähär′)n.
1. A mass of volcanic fragments, often mixed with water, moving rapidly down the side of a volcano.
2. The deposit produced by a lahar.
[Javanese, lava, lahar; akin to Hanunó'o (Malayo-Polynesian language of Mindoro) l´ʔad, dry streambed, arroyo, and Malay dialectal (Thailand and northern peninsular Malaysia) lahar, pool of water in the jungle.]
laharlahar flowing from the crater of Mt. St. Helens
March 19, 1982