‖ microbionBiol.|maɪˈkrəʊbɪən| Pl. microbia. Mod. Latin form of microbe. 1883Athenæum 27 Oct. 538/1 The treatment of diseases due to microbia.1884Science IV. 145/1 These [reports]..by no means demonstrate that the active principle of cholera resides in a microbion.