Standard Lemma guide

trophoblast

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • UK: /ˈtɹɒfə(ʊ)blɑːst/

1

noun

Meaning 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.

Definition source: English Wiktionary via Wiktextract

Topics: biology, cytology, medicine, natural-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall

Definition source: Princeton WordNet 3.0

Examples

  • after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: membrane, tissue layer

History

Etymology

From tropho- + -blast.