Breadcrumb Home > Dictionary > Index B blastosphere: Meaning and Definition of Find definitions for: blas•to•sphere Pronunciation: (blas'tu-sfēr"), [key] — n. Embryol. a blastula, esp. a blastocyst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blastosphere (Thesaurus) blastopore blastospore TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: antiphon Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language