Blastocheme is a term used in biology to describe a specialized cell cluster that forms during embryonic development. The spelling of the word is pronounced /ˈblæstoʊkiːm/. The first syllable "blas" is pronounced similarly to "blast," while the second syllable "to" has a short sound like in "top." The ending "cheme" is pronounced with a long "e" sound and a silent "h." This unique spelling and pronunciation are essential for scientists to accurately communicate and describe the development of organisms.