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A Twin

  1. 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.
  2. Either of two similar or closely related objects, entities etc.
  3. A room in a hotel, guesthouse, etc. with two beds; a twin room.
  4. (US) A twin size mattress or a bed designed for such a mattress.
  5. (crystallography) A twin crystal.
Synonyms

twindle, twinling, doublet (in the sense of twins and triplets)