manubrium

noun pl. -·bria--ə or -·bri·ums

a handlelike structure, process, or part; esp.,

1. the portion of a jellyfish or other cnidarian that bears the mouth at its tip
2. the uppermost of the three bony segments constituting the breastbone in mammals

Etymology: L, a handle, hilt, haft < manus, a hand: see manual