thenar
adjective
the·nar ˈthē-ˌnär 
-nər
: of, relating to, involving, or constituting the ball of the thumb or the intrinsic musculature of the thumb
Word History
Etymology
New Latin, palm of the hand, from Greek; akin to Old High German tenar palm of the hand
First Known Use
circa 1857, in the meaning defined above
Medical Definition
thenar
adjective
the·nar ˈthē-ˌnär -nər
-nər : of, relating to, involving, or constituting the thenar eminence or the thenar muscles