A medical condition characterized by abnormal narrowing or constriction of blood vessels or ducts.
From Greek 'angion' (vessel) + 'stegnos' (narrow, tight) + 'osis' (condition). This technical medical term emerged in the 19th century to precisely describe vascular narrowing conditions.
This word perfectly captures how medical terminology layers Greek roots to be extremely specific—doctors can describe exactly what's wrong with blood vessels without needing a whole sentence!
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