PLUVIAL Meaning of PLUVIAL in English adj. & n.adj. 1 of rain; rainy. 2 Geol. caused by rain. n. a period of prolonged rainfall. pluvious adj. (in sense 1). [ L pluvialis f. pluvia rain ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012