Glossary of Terms: Multiple Birth

Irish Twins

A definition and explanation of Irish twins.

Mirror Image Twins

A definition and explanation of mirror image twins.

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.

Idioglossia - Definition of Idioglossia

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

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.