(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.
(Biol.) The viscous material of an animal or vegetable cell, out of which the various tissues are formed by a process of differentiation; protoplasm.
Unorganized material; elementary matter.
(Med.) A mixture of starch and glycerin, used as a substitute for ointments.
(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.