The Collaborative International Dictionary of English v.0.48:

Myxobacter \Myxobacter\ prop. n. (Microbiol.)
   One genus of myxobacteria.
   [PJC +PJC]

WordNet (r) 3.0 (2006):

myxobacter
    n 1: bacteria that form colonies in self-produced slime; inhabit
         moist soils or decaying plant matter or animal waste [syn:
         myxobacteria, myxobacterium, myxobacter, gliding
         bacteria, slime bacteria]