trep·o·ne·ma 
(trĕp′ə-nēmə)
(trĕp′ə-nēmə)n. pl. trep·o·ne·ma·ta (-mə-tə) or trep·o·ne·mas
Any of a group of spirochetes of the genus Treponema, including those that cause syphilis, pinta, and yaws.
[New Latin Treponēma, genus name : Greek trepein, to turn; see trep- in the Appendix of Indo-European roots + Greek nēma, thread; see (s)nē- in the Appendix of Indo-European roots.]
trep′o·nemal, trep′o·nema·tous (-nĕmə-təs) adj.