Enter a clue or pattern or both:
The Clue
Embryonic stage (8 letter answer)
The Answer
BLASTULA
Tags
Notes
The answer BLASTULA is so rare that it appears less than once every 2500 puzzles.
Definition
BLASTULA as a noun:
1. (blastula, blastodermic vesicle) = 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