leptospire
noun
lep·to·spire ˈlep-tə-ˌspī(-ə)r 
: any of a genus (Leptospira) of slender aerobic spiral-shaped spirochetes that are free-living or parasitic in mammals
leptospiral
ˌlep-tə-ˈspī-rəl
adjective 
Word History
Etymology
New Latin Leptospira, from Greek leptos + Latin spira coil — more at spire
First Known Use
1952, in the meaning defined above
Medical Definition
leptospire
noun
lep·to·spire ˈlep-tə-ˌspī(ə)r
: any spirochete of the genus Leptospira
called also leptospira