rainwater noun2 •Rainfall.In early December, as rainwaters had started the monthlong process of flooding mines and washing out rail lines, workers lined up before 1 p.m. at an easy-to-miss storefront depot in Mackay. — 2011 •Water (for a house, etc.) sourced from rain which has not joined a spring, stream or river, pond, lake or sea.Constructed of hard flint stone, which came as ballast from England and is now painted coral white, the house has a fishpond, or catchment, roof, dating from 1788, to collect rainwater. — 1987 formsrainwaters
