1. The innermost germ layer of an embryo; the endoderm.
Usage: biology; embryology; technical

Examples

• During early embryonic development, the entoblast forms the lining of the digestive tract.
• The entoblast gives rise to the lungs, liver, and pancreas.
• In comparative embryology, the entoblast is one of the three primary germ layers.
• The entoblast differentiates into various internal organs and tissues.