Webster's English Dictionary

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treponema

trepo.ne.ma or trepo.ne.ma.tous \.trep-*-'ne--m*\ \-m*t-*\ \-m*l\ 
   \-'nem-*t-*s, -'ne-m-\ n or trepo.ne.ma.ta or treponemas [NL, genus name, 
   deriv. of Gk trepein to turn + ne-ma thread, fr] pl . ne-n to spin - more 
   at TROPE, NEEDLE : any of a genus (Treponema) of spirochetes that 
   parasitize man and  other warm-blooded animals and include organisms 
   causing syphilis and yaws - trepo.ne.ma.l aj