Dictionaryad•stra•tumPronunciation: (ad'strā"tum, -strat"um), [key] —n., —pl. -stra•taPronunciation: (-strā"tu, -strat"u). [key] Historical Ling. a substratum or superstratum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
|