A structural component or inner layer within a system; in biology, sometimes referring to inner structural elements.
From Greek 'endo-' (within, inner) combined with a nominal suffix creating a noun for inner structures. This is a technical or specialized term with roots in biological terminology.
Words with 'endo-' prefixes form a hidden layer of anatomical vocabulary—enderon, endoderm, endoskeleton—each naming something hidden 'within' that supports external structures.
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