Poly can have multiple meanings:
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- As a prefix, often meaning more than one or many (e.g., polyvalent - capable of many valences)
- As a feminine given name (Poly, also spelled Polly). Sometimes also used as a nickname for surnames such as "Polyblank"
Poly is also commonly used as an abbreviation for various words and phrases including:
- Science and technology
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- Polyethylene, polyurethane and polyester, all forms of plastic polymers
- Polysilicon, a state of silicon used as a gate material in MOSFET transistors and CMOS microchips
- Polystyrene, aromatic polymer made from the aromatic monomer styrene
- Poly-A, a step in the transcription of DNA to RNA in which multiple adenosine nucleosides are added to the 3' end of the mRNA sequence.
- Polymorphism, polymorphism describes multiple possible states for a single property
- Polyphenol, a class of biological molecules
- Polyspheric, a shape composed of more than one sphere, a term used by Chrysler to identify their hemi-derived but lower cost V8 engines built 1955-67
- Polygraph, or "lie detector" (particularly in Defense & Intelligence fields)
- Mathematics and logic
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- Polygon, especially in relation to 3D graphics as used in terms such as high-poly
- Polynomial, a type of mathematical function
- Universities
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- Polytechnic Institute of NYU, often called Poly by its students and faculty.
- Other
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- Polyamory, polygamy, and certain other forms of nonmonogamy beginning in poly
- Polyclinic, a clinic where a wide range of health care services (including diagnostics) can be obtained without the need for an overnight stay
- Polytechnic educational institutions
- Polymath, a person well educated in a wide variety of subjects or fields
- Polydactyly, having extra digits in hands or feet
- Polymita, Business Process Management Suite
- Poly Technologies, Chinese company
- China Poly Group, Chinese business group
- Polynesian, as in "Being a Poly" by Jonah Takalua
- Polyglot, a person who uses many languages
- Polyphasic sleep, the practice of sleeping multiple times in a 24-hour period
- Polytheism is the belief in and/or worship of multiple deities
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