presomite embryo
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pre·so·mite em·bry·o
an embryo before the appearance of the first pair of somites, which are notable about 20-21 days after fertilization in humans.
presomite embryo
[prēsō′mīt]
Etymology: L, prae + Gk, soma, body, en, in, bryein, to grow
an embryo in any stage of development before the appearance of the first pair of somites (segments), which in humans usually occurs around 19 to 21 days after fertilization of the ovum.