detumescence
Concise Oxford English Dictionary © 2008 Oxford University Press:
detumescence /ˌdiːtjʊˈmɛs(ə)ns/
▶noun the process of subsiding from a state of tension, swelling, or sexual arousal.
– derivatives
detumesce verb,
detumescent adjective.
detumesce verb,
detumescent adjective.
– origin C17: from L. detumescent-, detumescere, from de- ‘down, away’ + tumescere ‘to swell’.
'detumescence' also found in these Oxford entries:

