Definition of plasma

• colorless watery fluid of blood and lymph containing no cells and in which erythrocytes and leukocytes and platelets are suspended
• a green slightly translucent variety of chalcedony used as a gemstone
• (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"