a storm with heavy rain.

1810–20; rain + storm

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To rainstorm
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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