Wiktionary
alt. A spontaneous, persistent, and uncontrollable genital arousal, with or without orgasm or genital engorgement, unrelated to any feelings of sexual desire. n. A spontaneous, persistent, and uncontrollable genital arousal, with or without orgasm or genital engorgement, unrelated to any feelings of sexual desire.
Wikipedia
Persistent genital arousal disorder (PGAD), originally called persistent sexual arousal syndrome (PSAS), Weiss Disease, and also known as restless genital syndrome (ReGS or RGS), results in a spontaneous, persistent, and uncontrollable genital arousal, with or without orgasm or genital engorgement, unrelated to any feelings of sexual desire. It was first documented by Dr. Sandra Leiblum in 2001, only recently characterized as a distinct syndrome in medical literature with a comparable counterpart increasingly reported by men.
Some physicians use the term persistent sexual arousal syndrome to refer to the condition in women; others consider the syndrome of priapism in men to be the same disorder. Priapism was a recognized, diagnosable medical condition in the Diagnostic and Statistical Manual of Mental Disorders IV, whereas PGAD was not. However, PGAD was added to the DSM-5, which was published in May 2013.
In particular, it is not related to hypersexuality, sometimes known as nymphomania or satyriasis. (Hypersexuality, nymphomania, and satyriasis are also not recognized diagnosable medical conditions by the DSM-IV).