thenar UK /ˈθiːnə/US /ˈθinɑɹ/noun 2adjective 1forms 1 noun2 •The ball of the thumb, or the muscle controlling it. •(no longer used) The palm of the hand or sole of the foot.the parts of the human anatomy most sensitive to cold being the nape, stomach, and thenar or sole of foot? — 1922 adjective1 •Relating to the palm of the hand or the sole of the foot. formsthenars
