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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, …

  3. 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.

  4. TWIN Definition & Meaning | Dictionary.com

    Twin definition: either of two children or animals brought forth at a birth.. See examples of TWIN used in a sentence.

  5. TWIN | English meaning - Cambridge Dictionary

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

  6. 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 …

  7. twin - Wiktionary, the free dictionary

    Oct 31, 2025 · twin (third-person singular simple present twins, present participle twinning, simple past and past participle twinned) (transitive, obsolete outside Scotland) To separate, divide.

  8. All About Twins | The Texas Twin Project

    About 32 out of every 1000 people is a twin! Identical twinning seems to be due just to chance. Some people have suggested that having fraternal twins is hereditary: If someone else in your …

  9. What Are The Different Types Of Twins? | Ask A Biologist

    There are two main types of twins. One is identical twins, like Jennah and Sana, and the other is fraternal twins. Let’s learn more about each type. Identical twins develop from a single …

  10. twin - WordReference.com Dictionary of English

    either of two persons or things closely resembling each other. adj. [before a noun] being a twin or twins: twin sisters. being two persons or things closely related to each other. being one of a …