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[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 Dictionary, © Random House, Inc. 2015.
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Examples from the web for lahar
  • The lahar was terrifyingly high and steaming hot, they reported.
  • Wood fragments in two channel-fill deposits gave ages similar to lahar deposits upstream.
  • Dark streaks on pyroclastic-flow deposits are lahar deposits generated by rains.
  • It is already mixed with rock debris eroded from the crater walls, and this debris would augment the formation of a lahar.
  • The lahar and flood destroyed six mostly not-yet-occupied summer ranch houses.
  • Deposits described herein are part of a dynamic system involving large ignimbrite sheets and lahar conveyance channels.
British Dictionary definitions for lahar


a landslide of volcanic debris mixed with water down the sides of a volcano, usually precipitated by heavy rainfall
Word Origin
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
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lahar in Science
  1. 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.

  2. The deposit produced by such a flowing mass.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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