‖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. [ 1913 Webster ]

‖ 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. [ 1913 Webster ]