Leptothrix /(lĕp"tō̇*thrĭks)/

Lep·to·thrix

Leptothrix

n.
  1. A genus of bacteria, characterized by having their filaments very long, slender, and indistinctly articulated. (Biol.)

Leptothrix

a.
  1. Having the form of a little chain; -- applied to bacteria when, as in multiplication by fission, they form a chain of filiform individuals. (Biol.)