collector: the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes
physical entity: an entity that has physical existence
superclass myriapoda: used in some classifications to encompass the millipedes (Diplopoda) and centipedes (Chilopoda); formerly a large taxon including also the Pauropoda and Symphyla; the term Myriapoda now usually used synonymously with Diplopoda and limited to the millipedes