The Collaborative International Dictionary of English v.0.48:
Thenal \The"nal\, Thenar \The"nar\, a. [NL., fr. Gr. ?.] (Anat.) Of or pertaining to the thenar; corresponding to thenar; palmar. [1913 Webster]WordNet (r) 3.0 (2006):
thenal adj 1: of or relating to the palm of the hand or to the area at the base of the thumb [syn: thenal, thenar]