myxosporidian

from WordNet (r) 3.0 (2006)

myxosporidian
    n 1: mostly parasitic in fishes and including various serious
         pathogens

from The Collaborative International Dictionary of English v.0.48

myxosporidian \myxosporidian\ n.
   An organism of the order {Myxosporidia}, mostly parasitic in
   fishes and including various serious pathogens.
   [WordNet 1.5]