primitive knot

noun

Medical Definition of primitive knot

: a knob of cells at the anterior end of the primitive streak that is the point of origin of the embryonic head process — see tail bud

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“Primitive knot.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/primitive%20knot. Accessed 23 Nov. 2020.

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