thiobacillus

noun, plural thi·o·ba·cil·li [thahy-oh-buh–sil-ahy] /ˌθaɪ oʊ bəˈsɪl aɪ/. Bacteriology.

1. any of several rod-shaped bacteria of the genus Thiobacillus, inhabiting soil, sewage, etc., that derive energy from oxidation of sulfur or sulfur compounds.