Miscarriage When an embryo or fetus dies before the 20th week of pregnancy. Related Articles: Glossary: Complete miscarriageGlossary: Dilation and curettage (d & c)Glossary: Inevitable miscarriageGlossary: Spontaneous abortionPremenstrual Dysphoric Disorder & the Language of DiagnosisHave you heard of Premenstrual Dysphoric Disorder? Not likely. Sasha Co- Founder of Psych n Sex, previous writer and campus educator for the Kinsey Institute & published psychology researcher. Manhattan girl obsessed with post ww2 abstract expressionism, beet juice, vintage clothing & Scandinavia.