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The Clue

Embryonic stage (8 letter answer)

The Answer

BLASTULA

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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