I. -ˈklā-vē-ən adjective
Etymology: New Latin subclavius, from sub- + clavicula clavicle
Date: 1646
: of, relating to, being, or inserted into a part (as an artery, vein, or nerve) located under the clavicle
subclavian catheter
II. noun
Date: 1719
: a subclavian part (as an artery, vein, or nerve)