1. Parenting
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Glossary of Terms: Multiple Birth

This glossary provides explanations of terms related to twins and multiple birth.

Supertwins
The term supertwins is defined in this glossary of terms related to multiple birth.

Triplets
The term triplets is defined in this glossary.

Parenting Multiples Glossary
What's a nonuplet? What does it mean if my twins are monochorionic? Consult this glossary for definitions and explanations of terms commonly associated with multiple pregnancy and birth.

Amnion
A glossary entry that provides definition of the term amnion as relevant to twin pregnancy.

Idioglossia - Definition of Idioglossia
Definition of the term idioglossia, a term used to describe the phenomenon of twin talk.

Irish Twins
A definition and explanation of Irish twins.

Mirror Image Twins
A definition and explanation of mirror image twins.

Semi-Identical Twins
A new type of twin type called semi-identical twins has been identified.

Superfetation
Definition of superfecundation, term used to describe twins conceived at different times.

Superfecundation
Definition of superfecundation, term used to describe twins with different fathers.

Trizygotic
Trizygotic triplets form from three distinct egg/sperm combinations.

Uterus didelphys
A glossary entry that provides definition of the condition uterus didelphys, or double uterus, as relevant to pregnancy.

Perinatologist
A glossary entry that provides definition of perinatologist, a doctor who may treat a woman during pregnancy with multiples.

Zygosity
A definition of the term zygosity, used to describe types of twins.

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