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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. 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...

  3. Twin | Identical, Monozygotic, Dizygotic | Britannica

    Nov 21, 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 …

  4. 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.

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

    6 days ago · Identical twins, born from a single fertilized egg, continue to fascinate and guide medical research. Learn about twins, from conception onwards.

  6. 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.

  7. twin - Wiktionary, the free dictionary

    5 days ago · twin (plural twins) Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling. synonyms

  8. 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 …

  9. Twin Definition & Meaning - YourDictionary

    Twin definition: One of two identical or similar people, animals, or things; a counterpart.

  10. TWIN definition in American English | Collins English Dictionary

    Twins are two people who were born at the same time from the same mother. Sarah was looking after the twins. I think there are many positive aspects to being a twin.