Etymology
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embryo (n.)

"fetus in utero at an early stage of development," mid-14c., from Medieval Latin embryo, properly embryon, from Greek embryon "a young one," in Homer, "young animal," later, "fruit of the womb," literally "that which grows," from assimilated form of en "in" (from PIE root *en "in") + bryein "to swell, be full."

updated on May 07, 2017

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Definitions of embryo from WordNet

embryo (n.)
(botany) a minute rudimentary plant contained within a seed or an archegonium;
embryo (n.)
an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life;
Synonyms: conceptus / fertilized egg
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.