miscarriage

n. spontaneous abortion; failure to achieve the intended outcome

Miscarriage or spontaneous abortion is the natural or spontaneous end of a pregnancy at a stage where the embryo or the fetus is incapable of surviving, generally defined in humans at a gestation of prior to 20 weeks. Miscarriage is the most common complication of early pregnancy. The medical term "spontaneous abortion" is used in reference to miscarriages because the medical term "abortion" refers to any terminated pregnancy, deliberately induced or spontaneous, although in common parlance it refers specifically to active termination of pregnancy.
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Miscarriage means loss of an embryo or fetus before the 20th week of pregnancy. [more]Miscarriage - Community and Resources

Noun
1. failure of a plan
(synonym) abortion
(hypernym) failure
(derivation) fail, go wrong, miscarry
2. a natural loss of the products of conception
(synonym) spontaneous abortion, stillbirth
(hypernym) abortion
(hyponym) habitual abortion
(derivation) miscarry

(n.)
Unfortunate event or issue of an undertaking; failure to attain a desired result or reach a destination.
  

(n.)
The act of bringing forth before the time; premature birth.
  

(n.)
Ill conduct; evil or improper behavior; as, the failings and miscarriages of the righteous.