DictionarytwinOffspring born together
noun / adjective / verb

twin

TWIN/twɪn/

One of two offspring born together.

The mother cradles one newborn twin in each arm.

A young mother cradles her two newborn twins together, one in each arm, making the pair from a single birth the clear focus.
Etymology

Old English getwinn meant “double,” and its plural named two born at one birth. The singular noun identifies one member of that birth-pair, rather than the pair as a whole.

In context

OWN0:15
a single fertilized egg splits in the womb creating two genetically identical people but despite how little we know about them twins have a lot to reveal about us twin studies Give us new ways of understanding human behavioral phenomena
Twins: Is it All in the Genes? | Our America with Lisa Ling | Oprah Winfrey Network

More examples

  • My twin sister and I have very different personalities.
  • The sheep gives birth to twins in the spring.
  • Fraternal twins can be a boy and a girl.

Forms

twin · twins

Similar words

sibling
Any brother or sister, not necessarily from the same pregnancy.