WordNet (r) 3.0 (2006):

kingdom Prokaryotae
    n 1: prokaryotic bacteria and blue-green algae and various
         primitive pathogens; because of lack of consensus on how to
         divide the organisms into phyla informal names are used for
         the major divisions [syn: Monera, kingdom Monera,
         Prokayotae, kingdom Prokaryotae]