slime bacteria sli·me·bac·teria uncommon noun 1. bacteria that form colonies in self-produced slime; inhabit moist soils or decaying plant matter or animal waste Synonymsmyxobacteriamyxobacteriummyxobactergliding bacteriaslime bacteria Related words Broader terms eubacteria Parts order Myxobacteria WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.