noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The membrane of cells that forms the wall of a blastocyst during early pregnancy, providing nutrients to the embryo and later developing into part of the placenta.
2. 2
   the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall wordnet

Etymology

From tropho- + -blast.

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