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olfactory bulb
olibanum
oligarch
oligarchy
oligo-
Oligocene
oligochaete
oligoclase
oligomenorrhea
oligomer
oligonucleotide
oligonucleotide primer
oligopeptide
oligophagous
oligopoly
oligopsony
oligosaccharide
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oligomenorrhea
ol·i·go·men·or·rhe·a [ òlligō mennə r ə ] or ol·i·go·men·or·rhoe·a [ òlligō mennə r ə ]


noun 
Definition:
 
infrequent menstrual periods: menstruation occurring at much longer intervals than normal, often at intervals of more than 40 days
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