The Collaborative International Dictionary of English v.0.48:

Plasma \Plas"ma\, n. [See Plasm.]
   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.
      [1913 Webster]

   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.
      [1913 Webster]

   3. Unorganized material; elementary matter.
      [1913 Webster]

   4. (Med.) A mixture of starch and glycerin, used as a
      substitute for ointments. --U. S. Disp.
      [1913 Webster]

   5. same as blood plasma.
      [PJC]

   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.

   Note: In a typical plasma, the number of positive and
         negative particles are approximately equal. Plasmas are
         found naturally in the atmosphere of stars, and can be
         created in special laboratory apparatus.
         [PJC]

   Blood plasma (Physiol.), the colorless fluid of the blood,
      in which the red and white blood corpuscles are suspended.
      It may be obtained by centrifuation of blood to remove the
      blood cells. It is distinguished from serum in that
      plasma still has the fibrin of blood, and may be clotted,
      while in serum the fibrin has been removed.

   Muscle plasma (Physiol.), the fundamental part of muscle
      fibers, a thick, viscid, albuminous fluid contained within
      the sarcolemma, which on the death of the muscle
      coagulates to a semisolid mass.
      [1913 Webster +PJC] Plasmatic

WordNet (r) 3.0 (2006):

blood plasma
    n 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: plasma, plasm, blood plasma]