leptothrix
Lep"to*thrix, n. Etym: [NL., fr. Gr. (Biol.) Defn: A genus of bacteria, characterized by having their filaments very long, slender, and indistinctly articulated. Lep"to*thrix, a. Etym: [See Leptothrix, n. ] (Biol.) Defn: Having the form of a little chain; -- applied to bacteria when, as in multiplication by fission, they form chain of filiform individuals.