The term plasma to a physician means the fluid part of blood, lymph, or milk as distinct from suspended matter.
The term plasma to a physicist means a collection of negatively charged electrons and positively charged ions, existing in about equal numbers in a neutral state; plasma is considered a fourth state of matter, distinct from gases, liquids, and solids.
The term plasma to a geologist means a kind of quartz, green, faintly translucent, semiprecious, and a variety of chalcedony.