Dictionary

primitive streak

noun

Definition of PRIMITIVE STREAK

:  an elongated band of cells that forms along the axis of a developing fertilized egg early in gastrulation and that is considered a forerunner of the neural tube and nervous system
ADVERTISEMENT

First Known Use of PRIMITIVE STREAK

1854
Medical Dictionary

primitive streak

noun

Medical Definition of PRIMITIVE STREAK

:  an elongated band of cells that forms along the axis of an embryo early in gastrulation by the movement of lateral cells toward the axis and that develops a groove along its midline through which cells move to the interior of the embryo to form the mesoderm

Browse

Next Word in the Dictionary: primitive waterPrevious Word in the Dictionary: primitive segmentAll Words Near: primitive streak
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears