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Swelling of a limb; especially (more fully "†phlegmasia alba", "phlegmasia dolens") phlegmasia alba dolens; an instance of this. Later also: phlegmasia cerulea dolens.
Early 18th century (in an earlier sense). From post-classical Latin phlegmasia from ancient Greek ϕλεγμασία inflammation, swelling (Hippocrates) from ϕλέγμα + -σία.