Abnormally light or infrequent menstruation

WordNet Word definitions in WordNet
n. abnormally light or infrequent menstruation

Wiktionary Word definitions in Wiktionary
alt. infrequent or light menstrual periods in women of child-bearing age. n. infrequent or light menstrual periods in women of child-bearing age.

Wikipedia Word definitions in Wikipedia
Oligomenorrhea (or oligomenorrhoea ) 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. Also, menstrual periods ...