Word Games
Word of the Day
New Words & Slang
Video
My Favorites
View your list of saved words.
(You can log in using Facebook.)

primitive knot

noun

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

Take Our 10-Question Quiz


	Name That Thing Take our visual vocab quiz Test Your Knowledge »

	True or False? A quick quiz about stuff worth knowing Take It Now »


	Join Us on FB & Twitter Get the Word of the Day and More Facebook \| Twitter

	Get Our Free Apps Voice Search, Favorites, Word of the Day, and More iPhone \| iPad \| Android \| More