Pronunciation: (u-lOO'vē-um), [key]
—pl. -vi•ums, -vi•aPronunciation: (-vē-u). [key]
1. a deposit of sand, mud, etc., formed by flowing water.
2. the sedimentary matter deposited thus within recent times, esp. in the valleys of large rivers.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.