Meaning of pluvial

plu•vi•al

Pronunciation: (pl'vē-ul), [key]
— adj.
  1. of or pertaining to rain, esp. much rain; rainy.
  2. occurring through the action of rain.
—n.
  1. a rainy period formerly regarded as coeval with a glacial age, but now recognized as episodic and, in the tropics, as characteristic of interglacial ages.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.