Conductor Definition. In science, a conductor is a material which permits a flow of energy. A material which allows the flow of charged particles is an electrical conductor. A material which allows the transfer of thermal energy is a thermal conductor or heat conductor. Although electrical and thermal conductivity is most common, other types of energy may be transferred.
Define polymyositis: inflammation of several muscles at once; specifically : an inflammatory muscle disease of unknownâ¦ â polymyositis in a sentence inflammation of several muscles at once; specifically : an inflammatory muscle disease of unknown cause that affects muscles and chiefly skeletalâ¦ See the full definition
There are many different types of myositis, including: 1  Idiopathic inflammatory myopathies. In this rare group of muscle diseases, the cause of the muscle inflammation is unknown (idiopathic). There are three major types: dermatomyositis, polymyositis and inclusion body myositis.