A hard, skeletal part located on the inner surface of an organism's body structure.
From Greek 'entos' (inside), 'scleros' (hard), and '-ite' (mineral or part). This scientific term combines anatomical and mineralogical terminology to describe internal hardened structures.
The suffix '-ite' usually means a mineral or fossil, so 'entosclerite' sounds like a rock you'd find inside something—and that's basically what it is for organisms with interior skeletal supports.
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