The story
From New Latin subclavius + -ian, from sub- (“under”) + clavicula (“collar bone, clavicle”) + -ius (adjectival suffix).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Relating to or denoting an artery or vein which serves the neck and arm on the left or right side of the body. Full definition →
From New Latin subclavius + -ian, from sub- (“under”) + clavicula (“collar bone, clavicle”) + -ius (adjectival suffix).
Etymology from Wiktionary, CC BY-SA 4.0.