Definition of endoderm in English:



mass nounZoology Embryology
  • The innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.

    • ‘In this tissue, therefore, the fate of some of the cells has been changed from prospective gut endoderm to mesoderm and ectoderm.’
    • ‘These cells, usually seen as being mesodermal, apparently represent another cell line originating from endoderm.’
    • ‘In addition, they act as messengers, bearing molecular orders to the mesoderm and endoderm which they contact on arrival.’
    • ‘At a tissue level, an adult hydra is essentially a tube composed of two tissue layers, the ectoderm and the endoderm, which extend throughout the animal.’
    • ‘Other asymmetric anatomical features - such as placement of the heart and liver - are products of different layers, the mesoderm and endoderm.’


Mid 19th century from endo-‘within’ + Greek derma ‘skin’.