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The word plasma has a Greek root which means "to be formed or molded" (the word plastic shares this root).
- In physics and chemistry, a plasma is an ionised gas characterized by collective electromagnetic behavior. For more information see the article on plasma physics.
- In medicine, the fluid portion of blood is known as blood plasma, but lymph and intramuscular fluid can also be referred to as plasma (first used in 1839).
- The word may also refer to the fluid portion of milk; whey (first used in early 20th century).
- In geology, plasma is a green type of chalcedony (now rare—first used in 1772).
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