We found one dictionary that defines the word formative cells:

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1. formative cells: Vocabulary.com

(Note: See formative_cell as well.)

Definitions from WordNet (formative cell) ▸ noun:  a cell of an embryo ▸ Also see formative_cell ▸ Words similar to formative cells ▸ Usage examples for formative cells ▸ Idioms related to formative cells ▸ Wikipedia articles (New!) ▸ Words that often appear near formative cells ▸ Rhymes of formative cells ▸ Invented words related to formative cells