noun
1. : end bulb 1
2. : the knob of tissue undifferentiated into germ layers that forms the primitive knot and later forms posterior portions of the body of an embryo
noun
1. : end bulb 1
2. : the knob of tissue undifferentiated into germ layers that forms the primitive knot and later forms posterior portions of the body of an embryo
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012