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dorsal lip

noun Embryology.
  1. the dorsal marginal region of the blastopore, which acts as a center of differentiation: as cells move through this region to the interior of the embryo during gastrulation, they acquire the ability to induce the overlying ectoderm to develop into a variety of tissues.
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Origin of dorsal lip

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018