spirochaeticide
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spirochaeticide — spi·ro·chae·ti·cide … English syllables
spirochaete — n. spirally moving, disease producing organism. ♦ spirochaetaemia, n. presence of these in blood. ♦ spirochaeticide n. substance killing these. ♦ spirochaetosis, n. infection by these … Dictionary of difficult words