The inner layer or interior region of a spherical structure, especially in biological or geological contexts.
From Greek 'entos' (inside) and 'sphaira' (sphere). This scientific term builds from basic geometric concepts to describe internal zones of spherical bodies.
If you think of Earth as a sphere, the 'entosphere' would be everything underground—it's a word that could apply to planets, cells, or even atoms, wherever there's an inside to explore.
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