blastocyst
noun/ˈblæstəsɪst/
Frequency rank: #19,709 of 20,003 in the WORDED list (wordfreq data)
Meaning
An early-stage embryo consisting of a hollow ball of cells, formed about five days after fertilization.
Example sentence
After fertilization, the embryo develops into a hollow ball of cells called the blastocyst before implanting in the uterine wall.
Synonyms & related words
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