Webster's English Dictionary

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spirochete

spi.ro.chete or spi.ro.chaete \'spi--r*-.ke-t\ n [NL Spirochaeta, genus of 
   bacteria, fr. L spira coil + Gk chaite]- long hair - more at SPIRE, CHAETA 
   : any of an order (Spirochaetales) of slender spirally undulating bacteria  
   including those causing syphilis and relapsing fever