In anatomy, the outer layer or external aspect of a bodily structure or organ; relating to the outside.
From Latin exterus (outer, external), the comparative form of exter meaning 'outside.' This technical anatomical term is rarely used in modern medicine, which prefers terms like 'external' or 'superficial.'
Medieval anatomists used 'exter' to distinguish the outer layer of organs from the inner layers—it's a word that lost out to clearer terminology, but shows how anatomy once borrowed directly from Latin structure.
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