accessory cephalic vein ac·ces·so·rycephalicvein uncommon noun 1. a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow Synonymsaccessory cephalic veinvena cephalica accessoria Related words Broader terms vein Parts forearm WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
