\Lep"to*thrix\ (l[e^]p"t[-o]*thr[i^]ks), n. [NL., fr.
Gr. lepto`s small + qri`x hair.] (Biol.)
A genus of bacteria, characterized by having their filaments
very long, slender, and indistinctly articulated.

\Lep"to*thrix\, a. [See {Leptothrix}, n. ] (Biol.)
Having the form of a little chain; -- applied to bacteria
when, as in multiplication by fission, they form a chain of
filiform individuals.