The Collaborative International Dictionary of English v.0.48:
Detumescence \De`tu*mes"cence\, n. [L. detumescere to cease swelling; de + tumescere, tumere, to swell.] Diminution of swelling; subsidence of anything swollen. [R.] --Cudworth. [1913 Webster]WordNet (r) 3.0 (2006):
detumescence n 1: diminution of swelling; the subsidence of anything swollen