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