Other forms: rainstorms
A rainstorm is a storm bringing heavy rain. Caught in a rainstorm.
It is defined by the rain rather than the wind, which is what separates it from a gale. A summer rainstorm drops more water in an hour than a wet week in winter.
1nounrainstormA storm bringing heavy rain.
“The rainstorm flooded the road within about twenty minutes.”
rainstorm is a storm.
Rain plus storm, one of the plainest compounds in English.
From rain + storm.
Etymology from Wiktionary, CC BY-SA