of or pertaining to rain, especially much rain; rainy.
Geology. occurring through the action of rain.
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.

1650–60; < Latin pluviālis, equivalent to pluvi(a) rain + -ālis -al1

interpluvial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pluvial (ˈpluːvɪəl)
1.  of, characterized by, or due to the action of rain; rainy: pluvial insurance
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
[C17: from Latin pluviālis rainy, from pluvia rain]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1656, "pertaining to rain," from Fr. pluvial (12c.), from L. pluvialis "pertaining to rain," from (aqua) pluvia "rain (water)," from fem. of pluvius "rainy," from plovere "to rain," from PIE base *pleu- "to flow, to swim" (cf. Skt. plavate "navigates, swims;" Gk. plynein "to wash," plein "to navigate;"
O.E. flowan "to flow").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
pluvial   (pl'vē-əl)  Pronunciation Key 
Relating to or caused by rain.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Evidence of early human inhabitation has been found along the shorelines of pluvial lakes.
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