Definition of blastula in English:

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Pronunciation: /ˈblasCHələ/

noun (plural blastulas or blastulae /-ˌlē/)

An animal embryo at the early stage of development when it is a hollow ball of cells. Also called blastosphere.
Example sentences
  • With time, cells gradually become determined, so that similar cells taken from later-stage blastulas and early gastrulas develop according to their fate at the time of transplantation.
  • Gastrulation in its broadest sense is the reorganization of the cells of the blastula to form a multilayered embryo, the gastrula.
  • Embryos treated at lower concentrations showed delayed gastrulation and those treated at higher concentrations developed to blastulae having abnormal blastocoels with excess cells.


Late 19th century: modern Latin, from Greek blastos 'sprout'.

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