a slow reduction in swelling(= the condition of being larger than normal), especially in a penis that was in a state of sexual excitement肿胀:肿胀缓慢减少,特别是在处于性兴奋状态的阴茎中
Word Originlate 17th cent.: from Latin detumescere, from de- ‘down, away’+ tumescere ‘to swell’.