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  1. Twin - Wikipedia

    One twin, the 'donor' twin, is small and anemic, the other, the 'recipient' twin, is large and polycythemic. The lives of both twins are endangered by this condition.

  2. Twin | Identical, Monozygotic, Dizygotic | Britannica

    Oct 8, 2025 · Twin, either of two young who are simultaneously born from one mother. Twinning, common in many animals, is of two biological kinds: the one-egg (monozygotic), or identical, type …

  3. Types of Twins: Identical, Fraternal, and Other Unique Types

    Apr 25, 2023 · In a basic twin pregnancy, two embryos go their separate ways and develop into twin babies, whether identical or fraternal. Some unique sets of twins follow a different path.

  4. TWIN | definition in the Cambridge English Dictionary

    TWIN meaning: 1. either of two children born to the same mother on the same occasion: 2. one of two very similar…. Learn more.

  5. TWIN Definition & Meaning - Merriam-Webster

    The meaning of TWIN is either of two offspring produced in the same pregnancy. How to use twin in a sentence.

  6. Understanding Twins - Psychology Today

    There are different types of twins, identical and fraternal being the most common. Identical, or monozygotic, twins develop from the same fertilized egg that splits into two. These twins are...

  7. Identical Twins: DNA, Conception, Statistics, and More

    Apr 28, 2025 · Identical twins, also known as monozygotic twins, share the same egg at conception and are always either both boys or both girls. Fraternal twins, also known as dizygotic twins, come from …

  8. Expecting Two? Here Are 10 Surprising Facts About Twins

    Expecting two babies? Here are some fascinating tidbits about fraternal and identical twins you may not have heard before.

  9. Twin - definition of twin by The Free Dictionary

    1. Being two or one of two offspring born at the same birth: twin sisters. 2. Being two or one of two identical or similar people, animals, or things: twin cities; a twin bed. 3. Botany Of or relating to …

  10. Twin Facts and Myths - Twiniversity #1 Parenting Twins Site

    Oct 1, 2025 · Are twins really double the trouble? Keep reading to uncover the truth behind common twin myths and reveal the true twin facts.