plasma [plasma plasmas] BrE [ˈplæzmə] NAmE [ˈplæzmə] (also plasm BrE [ˈplæzəm] ; NAmE [ˈplæzəm] ) noun uncountable
1. (biology or medical) the clear liquid part of blood, in which the blood cells, etc. float
2. (physics) a gas that contains approximately equal numbers of positive and negative electric charges and is present in the sun and most stars
early 18th cent. (in the sense ‘mould, shape’): from late Latin, literally mould, from Greek plasma, from plassein ‘to shape’.
1. the colorless watery fluid of the blood and lymph that contains no cells, but in which the blood cells (erythrocytes, leukocytes, and thrombocytes) are suspended
Syn: plasm, blood plasma
2. a green slightly translucent variety of chalcedony used as a gemstone
3. (physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons
- particles in space exist in the form of a plasma
Webster's 1913 Dictionary:
|n.||1.||(Min.) A variety of quartz, of a color between grass green and leek green, which is found associated with common chalcedony. It was much esteemed by the ancients for making engraved ornaments.|
|2.||(Biol.) The viscous material of an animal or vegetable cell, out of which the various tissues are formed by a process of differentiation; protoplasm.|
|3.||Unorganized material; elementary matter.|
|4.||(Med.) A mixture of starch and glycerin, used as a substitute for ointments.|
|5.||same as blood plasma.|
|6.||(physics) a state of matter in which charged particles such as electrons and atomi nuclei have sufficiently high energy to move freely, rather than be bound in atoms as in ordinary matter; it has some of the properties of a gas, but is a conductor of electricity.|
Dictionary of Computing:
|PLASMA - PLAnner-like System Modelled on Actors. Carl Hewitt, 1975.The first actor language. Originally called Planner-73, andimplemented in MacLisp. Lisp-like syntax, but with severalkinds of parentheses and brackets.|
["A PLASMA Primer", B. Smith et al, AI Lab Working Paper 92,MIT Oct 1975].
["Viewing Control Structures as Patterns of Passing Messages",C. Hewitt, AI Lab Memo 410, MIT 1976].
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