<unk>  is infrequent (or, in occasional usage, very light) menstruation. More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year. Menstrual periods should have been regularly established before the development of infrequent flow. The duration of such events may vary.
Oligomenorrhea
Hypomenorrhea
Amenorrhea
Dysmenorrhea
Blennorrhoea
Oligospermia
Hypospermia
Blennorrhea