germ layer

any of the three layers of cells in an animal embryo at the gastrula stage, from which the various organs and tissues develop. The outermost layer is the ectoderm, the middle layer is the mesoderm, and the inner layer is the endoderm.

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Psychology term of the day

September 17th 2024

philosophy of mind

the branch of philosophy concerned with questions about the nature and functioning of mind and consciousness and the relationship of mind and mental activity to brain and body and to the external world (see mind–body problem). It is deeply concerned with the relationships among language, thought, and action.