embryo

A human or animal developing from a fertilized egg, before its body has fully started to take shape.

• The embryo is still very small.
• Doctors transferred one embryo into her womb.
• The study examined how human embryos develop during the first weeks.

Common phrases: human embryo, developing embryo, embryo transfer

A young living thing developing inside an egg, before it hatches or changes into its next form.

• The embryo grew inside the egg.
• We could see the chick embryo through the shell.
• The researchers compared fish embryos at different stages of growth.

Common phrases: chicken embryo, fish embryo, embryo development