2. Geology . occurring through the action of rain.
Swimming in the pluvial waters, or inert and caked over by the torrid mud, he would have discovered what he would certainly have regarded as lowly, specially-modified, and degenerate relations of the active denizens of the ocean—the Dipnoi , or mud-fish.
Nothing enters her tomb save a little moisture, pluvial in origin, and, it may be, certain mysterious effluvia of which we do not yet know the nature.
Origin: Pluvial is from the Latin pluvia meaning “rain, water.” It shares the Proto-Indo-European root pleu meaning “to flow, to swim” with Pluto , the name of God of the underworld in classical mythology.