TWIN

Definitions

1. 1. One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; -- used chiefly in the plural, and applied to the young of beasts as well as to human young.
2. 2. A sign and constellation of the zodiac; Gemini. See Gemini.
3. 3. A person or thing that closely resembles another.
4. 4. A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.