
Thermoforming is a manufacturing process where a plastic sheet is heated to a pliable forming temperature, formed to a specific shape in a mold, and trimmed to create a usable product. The sheet, or `film` when referring to thinner gauges and certain material types, is heated in an oven to a high-enough temperature that it can be stretched into .....
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http://en.wikipedia.org/wiki/Thermoforming

The process of forming a thermoplastic sheet into a three-dimensional shape by clamping the sheet in a frame, heating it to tender it soft and flowable. Then applying differential pressure to make the sheet conform to the shape of a mold or die positioned below the frame.
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http://www.blowmachines.com/glossary1.htm

(from the article `plastic`) When a sheet of thermoplastic is heated above its Tg or Tm, it may be capable of forming a free, flexible membrane as long as the molecular weight is ...
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http://www.britannica.com/eb/a-z/t/37

a process where film softened by heat is forced into or over a mould.
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http://www.pharmapackagingsolutions.com/expert-insights/glossary/

thermoforming A category of processing methods that use vacuum, air pressure, or mechanical energy to force a heated thermoplastic sheet into the shape of a mold; after cooling, the plastic part is removed from the mold and trimmed; used for boats, and components ranging from blister or bubble packaging to fender liners on automobiles.
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http://www.wordinfo.info/words/index/info/view_unit/4265/21

This is a process whereby a plastic sheet is heated and formed into a plastic product using a mould.
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https://www.dwplastics.co.uk/glossary/

Any process of forming thermoplastic sheet which consists of heating the sheet and pulling it down onto a mold surface.
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https://www.emcoplastics.com/plastic-glossary-of-terms/

The process of forming a thermoplastic sheet into a three-dimensional shape by clamping the sheet in a frame, heating it to render it soft, then applying differential pressure to make the sheet conform to the shape of a mold or die positioned below the frame.
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https://www.encyclo.co.uk/local/23693

Any process of forming thermoplastic sheet which consists of heating the sheet and forcing it onto a mold surface.
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https://www.rayplastics.com/learn-about-thermoforming/terms-definitions/

the process of heating a thermoplastic sheet to a working temperature and then forming it into a finished shape by means of heat or pressure.
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https://www.usplastic.com/knowledgebase/article.aspx?contentkey=784
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