1. The fluid-filled cavity within a blastula during early embryonic development.
Usage: biology; developmental biology; also spelled blastocoel

Examples

• The blastocoele expands as cells divide during the blastula stage.
• Fluid accumulates in the blastocoele, pushing cells outward.
• The size of the blastocoele varies depending on the species and developmental stage.
• During gastrulation, the blastocoele gradually diminishes as cell movements occur.
• Embryologists study the blastocoele to understand early cell differentiation.