SYN: cataplasia. [L. retrogressus fr. retrogradior, to go backwards]
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a) return to a former and less complex level of development or organization
b) subsidence or decline of symptoms or manifestations of a disease
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ret·ro·gres·sion (ret″ro-greshґən) [retro- + L. gressus course] degeneration; deterioration; regression; return to an earlier, less complex condition.Medical dictionary. 2011.