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manubrium ma·nu·bri·um (mə-nōō'brē-əm, -nyōō'-)
n. pl. ma·nu·bri·a (-brē-ə)
The upper segment of the sternum with which the clavicle and the first two pairs of ribs articulate.
The portion of the malleus that is embedded in the tympanic membrane and extends downward, inward, and backward from the neck of the malleus.