clav·i·cle 
(klăvĭ-kəl)
(klăvĭ-kəl)n.
1. Either of two slender bones in humans that extend from the manubrium of the sternum to the acromion of the scapula. Also called collarbone.
2. One of the bones of the pectoral girdle in many vertebrates.
[New Latin clāvīcula, from Latin, diminutive of clāvis, key (from its shape).]
cla·vicu·lar (klə-vĭkyə-lər) adj.
cla·vicu·late′ (-lāt′) adj.