\O`mo*ster"num\, n. [Omo- + sternum.] (Anat.)
(a) The anterior element of the sternum which projects
    forward from between the clavicles in many batrachians
    and is usually tipped with cartilage.
(b) In many mammals, an interarticular cartilage, or bone,
    between the sternum and the clavicle.