leptospira
noun
lep·to·spi·ra
| \ ˌlep-tō-ˈspī-rə
\
\
Medical Definition of leptospira
1
capitalized
: a genus of extremely slender aerobic spirochetes (family Leptospiraceae) that are free-living or parasitic in mammals and include a number of important pathogens (as L. icterohaemorrhagiae of Weil's disease or L. canicola of canicola fever)