1rain 
/ˈreɪn/ noun
plural rains /ˈreɪn/ noun 1 : water that falls in drops from clouds in the sky [noncount] ▪ The weatherman forecasts rain for this afternoon. ▪ We could hear the sound of (the) rain on the roof. ▪ Everyone went inside when the rain began to fall. ▪ He was standing outside in the pouring rain. [=rain falling in large drops and with a lot of force] ▪ Take an umbrella with you. It looks like rain. [=the sky looks the way it does when there is going to be rain] [count] ▪ spring/summer rains ▪ What the garden needs is a good, soaking rain. ▪ A light/heavy rain began to fall. ▪ There has been some flooding due to the recent heavy rains. — see also acid rain 2 [noncount] : weather in which there is a lot of rain : rainy weather
▪ We've had a week of rain. 3 rains [plural] : large amounts of rain that fall at a particular time of year
▪ The rains came and flooded the valley. 4 [singular] : a large amount of something falling from above
▪ a rain of ash/ashes
▪ We've had a week of rain.
▪ The rains came and flooded the valley.
▪ a rain of ash/ashes
(as) right as rain — see 1right
rain or shine or come rain, come shine or come rain or come shine
— used to say that something will happen even it rains ▪ The party will be on Tuesday, rain or shine. — sometimes used figuratively ▪ I'll always love you, come rain or come shine. [=I will love you no matter what happens]
— rain·less adjective
▪ a rainless week
▪ a rainless week
