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

• crumb cake
• crumble
• crumbliness
• crumbly
• crumbs
• crumby
• crumhorn
• crummy
• crump
• crumpet
• crumple
• crumple zone
• crumpled
• crunch
• crunchy
• crunk
• crupper
• crural
• crus
• crusade
• crusader
• cruse
• crush
• crush out
• crushed