detumescence
noun /ˌdiːtjuːˈmesns/
/ˌdiːtuːˈmesns/
[uncountable] (formal)- a slow reduction in swelling (= the condition of being larger than normal), especially in a penis that was in a state of sexual excitementWord Originlate 17th cent.: from Latin detumescere, from de- ‘down, away’+ tumescere ‘to swell’.