1. Early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
   - blastula

Derived forms: blastospheres

See also: blastospheric

Type of: conceptus, embryo, fertilised egg [Brit], fertilized egg

Encyclopedia: Blastosphere

• glovebox
• gloved
• gloveless
• glover
• glow
• glow discharge
• glow lamp
• glow tube
• glower
• glowering
• gloweringly
• glowing
• glowingly
• glowplug
• glowworm
• gloxinia
• Gloxinia perennis
• Gloxinia spesiosa
• gloze
• glucagon
• glucinium
• Gluck
• glucocorticoid
• Glucophage
• glucosamine