Spirochaetaceae
noun pluralSpi·ro·chae·ta·ce·ae | \ ˌspī-rə-kē-ˈtā-sē-ˌē 
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\Medical Definition of Spirochaetaceae
: a family comprising large coarsely spiral bacteria of the order Spirochaetales that are free-living in fresh or salt water or associated with animal or human hosts
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