/ Dictionary / Index B biostratigraphy: Meaning and Definition of Find definitions for: bi•o•stra•tig•ra•phy Pronunciation: (bī"ō-stru-tig'ru-fē), [key] — n. a branch of geology dealing with the differentiation of sedimentary rock units on the basis of the fossils they contain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. biostatistics biostrome Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language