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pluvial

[ploo-vee-uh l] /ˈplu vi əl/
adjective
1.
of or pertaining to rain, especially much rain; rainy.
2.
Geology. occurring through the action of rain.
noun
3.
Geology. a rainy period formerly regarded as coeval with a glacial age, but now recognized as episodic and, in the tropics, as characteristic of interglacial ages.
Origin
1650-1660
1650-60; < Latin pluviālis, equivalent to pluvi(a) rain + -ālis -al1
Related forms
interpluvial, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for inter-pluvial

pluvial

/ˈpluːvɪəl/
adjective
1.
of, characterized by, or due to the action of rain; rainy: pluvial insurance
noun
2.
(geology) of or relating to rainfall or precipitation
3.
a climate characterized by persistent heavy rainfall, esp one occurring in unglaciated regions during the Pleistocene epoch
Word Origin
C17: from Latin pluviālis rainy, from pluvia rain
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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Word Origin and History for inter-pluvial

pluvial

adj.

1650s, "pertaining to rain," from French pluvial (12c.), from Latin pluvialis "pertaining to rain, rainy, rain-bringing," from (aqua) pluvia "rain (water)," from fem. of pluvius "rainy," from plovere "to rain," from PIE root *pleu- "to flow, to swim" (cf. Sanskrit plavate "navigates, swims;" Greek plynein "to wash," plein "to navigate," ploein "to float, swim," plotos "floating, navigable;" Armenian luanam "I wash;" Old English flowan "to flow;" Old Church Slavonic plovo "to flow, navigate;" Lithuanian pilu, pilti "to pour out," plauju, plauti "to swim, rinse").

Online Etymology Dictionary, © 2010 Douglas Harper
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inter-pluvial in Science
pluvial
  (pl'vē-əl)   
Relating to or caused by rain.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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