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Definitions Found:

An animal embryo at the early stage of development when it is a hollow ball of cells

blastulaAn animal embryo at the early stage of development when it is a hollow ball of cells
blastulasAn animal embryo at the early stage of development when it is a hollow ball of cells
gastrulaeAn embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.