The term "blastospheric" refers to the early stage of an embryo, specifically the blastosphere. Synonyms for "blastospheric" can include words like pre-gastrulation, morula, pre-blastula, and pre-embryonic. These words all refer to the same developmental stage of the embryo when it begins to form a ball of cells that will eventually develop into a more complex organism. The choice of synonym depends on the specific context in which it is being used, but all of them have a similar meaning and can be used interchangeably to describe the biology of embryo development.