Relating to or causing congestion, especially in medical contexts where it refers to an abnormal accumulation of fluid, blood, or traffic in a space where it shouldn't be.
From Latin 'congestus,' past participle of 'congerere' (to heap together), from 'con-' (together) plus 'gerere' (to carry). The medical meaning developed in the 18th-19th centuries as physicians understood fluid dynamics in disease.
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