noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A blastula
2. 2
   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 wordnet

Synonyms

All synonyms

blastula

Etymology

From blasto- + -sphere.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.