Leptothrix
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Lep´to`thrix
(lĕp´tô`thrĭks) n. 1. (Biol.) A genus of bacteria, characterized by having their filaments very long, slender, and indistinctly articulated.
a. 1. (Biol.) Having the form of a little chain; - applied to bacteria when, as in multiplication by fission, they form a chain of filiform individuals.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.