western black-legged tick
noun
wes·tern black-legged tick
| \ ˈwes-tərn-ˈblak-ˌlegd-
\
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Medical Definition of western black-legged tick
: a tick of the genus Ixodes (I. pacificus) that is found in the western U.S. and British Columbia and is a vector of several diseases (such as Lyme disease)
— called also black-legged tick