a storm with heavy rain.

1810–20; rain + storm

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rainstorm (ˈreɪnˌstɔːm)
a storm with heavy rain

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It wasn't a rainstorm that residents battened down for, but mob reprisals.
The shepherd had made the discovery by chance while seeking shelter from a
  rainstorm decades ago.
However, the animals are easy to find in a rainstorm, since their upturned
  noses catch water and cause them to sneeze.
The flight lands in a rainstorm of mist and scattered drip-drops.
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