What do a.m. and p.m. stand for?


[vol-kuh-niz-uh m] /ˈvɒl kəˌnɪz əm/
noun, Geology
the phenomena connected with volcanoes and volcanic activity.
Also, vulcanism.
Origin of volcanism
1865-70; volcan(o) + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for volcanism
  • Early speculation centered on sudden catastrophe, perhaps volcanism or an earthquake or a deadly hurricane.
  • Climate, volcanism, plate tectonics all played a key role in regulating the oxygen level during various time periods.
  • volcanism has been the prime suspect, because lava flows can fill in and obscure craters.
  • In these setting you can develop bimodal volcanism where both basalt and rhyolite erupt.
  • As the volcanism continued, floral species vanished.
  • The volcanic rift zones have features and lava flows that indicate they have been active through several cycles of volcanism.
  • Evidence for active volcanism in the past, but now geologically inactive.
British Dictionary definitions for volcanism


those processes collectively that result in the formation of volcanoes and their products
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
Cite This Source
Word Origin and History for volcanism

1869, from French volcanisme; see volcano + -ism.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for volcanism

Few English speakers likely know this word

Word Value for volcanism

Scrabble Words With Friends