embryo noun

/ˈem.bri.əʊ/

/-oʊ/ n [C] (plural embryos)

Definition

an animal that is developing either in its mother's womb or in an egg, or a plant that is developing in a seed

Between the eighth week of development and birth a human embryo is called a foetus.

in embryo formal

developing and not yet complete

The department's plans for enlargement are still in embryo.

(Definition of embryo noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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If a problem preys on your mind, you think about it and worry about it a lot

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