LeptothrixLep"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.
LeptothrixLep"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.