1712, "form, shape" (earlier plasm), from Late Latin plasma, from Greek plasma "something molded or created," hence "image, figure; counterfeit, forgery; formed style, affectation," from plassein "to mold," originally "to spread thin," from PIE *plath-yein, from root *pele- (2) "flat, to spread" (see plane (n.1)). Sense of "liquid part of blood" is from 1845; that of "ionized gas" is 1928.
plasma plas·ma (plāz'mə) or plasm (plāz'əm)
The clear, yellowish fluid portion of blood, lymph, or intramuscular fluid in which cells are suspended.
Cell-free, sterilized blood plasma, used in transfusions.
Protoplasm or cytoplasm.
Note: Plasmas are usually associated with very high temperatures — most of the sun is a plasma, for example.