Definitions for oligomenorrhea
abnormally light or infrequent menstruation
Infrequent or light menstrual periods in women of child-bearing age.
U.S. National Library of Medicine
Abnormally infrequent menstruation.
Oligomenorrhea is infrequent menstruation. More strictly, it is menstrual periods occurring at intervals of greater than 35 days, with only four to nine periods in a year. Also, menstrual periods should have been regularly established previously before the development of infrequent flow. The duration of such events may vary.
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