detumescence

n.
Reduction or lessening of a swelling, especially the restoration of a swollen organ or part to normal size.

[From Latin dētumēscere, to subside : dē-, de- + tumēscere, to swell, inchoative of tumēre.]

detumescent de'tu·mes'cent adj.

(dē'tū-mĕs'əns, -tyū-)
n.

Reduction, subsidence, or lessening of a swelling, especially the restoration of a swollen organ or part to normal size.

The subsidence of congestion and swelling.