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Poly from Greek πολύς meaning many or much, may refer to:
- Polyethylene, a common plastic used in packaging
- Polyurethane, a polymer used in manufacture of hard-plastic objects
- Polyester, a category of natural and synthetic polymers
- Polystyrene, aromatic polymer made from the aromatic monomer styrene
Science and technology
- Polysilicon, a state of silicon used in transistors and microchips
- Poly-A, a step in the transcription of DNA to RNA
- Polyphenol, a class of biological molecules
- Polygraph, or "lie detector" (particularly in Defense & Intelligence fields)
- Polysaccharide, a sugar consisting of many monosaccharides
Mathematics and logic
- Polygon, especially in relation to 3D graphics as used in terms such as high-poly
- Polyspheric, a shape composed of more than one sphere
- Polynomial, a type of mathematical function
- Polyhedron, a 3-dimensional shape composed of more than one side
Schools and education
- Polytechnic Institute of NYU, often called Poly by its students and faculty
- Institute of technology or Polytechnic institute, an educational institution
- Polymath, a person well educated in a wide variety of subjects or fields
- Polydeuces, twin brother of Castor. Often called by his Roman name Pollux.
- Polydectes, king of Seriphos.
- Polyphemus, the Cyclops who imprisoned Odysseus and his men, who later escaped him.
- Polyamory, the practice of having more than one intimate relationship at a time with the consent of everyone involved
- Polygamy, a marriage which includes more than two partners
- China Poly Group, Chinese business group
- Poly Technologies, a defense manufacturing company and member of China Poly Group
- Polyclinic, a clinic where a wide range of health care services can be obtained
- Polydactyly, having extra digits in hands or feet
- Polynesians, various ethnic groups that inhabit Polynesia
- Polyphasic sleep, the practice of sleeping multiple times in a 24-hour period
- Polytheism, the belief in and/or worship of multiple deities
- Polyglotism, the ability to speak several languages with a high degree of proficiency
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