[ lah-hahr ]
/ ˈlɑ hɑr /

noun Geology.

a landslide of wet volcanic debris on the side of a volcano.
the deposit left by such a landslide.

Origin of lahar

1925–30; < Javanese: lahar, lava Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for lahar

/ (ˈlɑːhɑː) /


a landslide of volcanic debris mixed with water down the sides of a volcano, usually precipitated by heavy rainfall

Word Origin for lahar

C20: from Javanese: lava
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for lahar

[ lähär′ ]

A wet mass of volcanic fragments flowing rapidly downhill. Lahars usually contain ash, breccia, and boulders mixed with rainwater or with river or lake water displaced by the lava flow associated with the volcano.
The deposit produced by such a flowing mass.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.