spirocheticidal
adjective
spi·ro·che·ti·ci·dal
variants:
or chiefly British spirochaeticidal \ ˌspī-rə-ˌkēt-ə-ˈsīd-ᵊl 
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Medical Definition of spirocheticidal
: destructive to spirochetes especially within the body of an animal host
a spirocheticidal drug