What does "manubrium" mean?

The broad, upper part of the sternum.

Manubrium

Common synonyms include: episternum, manubrium sterni, mouth stalk, oral projection, sternal manubrium, upper sternum.

/məˈnubɹiəm/ noun

noun ·Rare ·Advanced level

Noun

1
The broad, upper part of the sternum.
2
the upper part of the breastbone wordnet
3
The tube extending from the central underside of a jellyfish and ending in a mouth.
4
A cell that projects inward from the centre of the shields in the globule of Chara.
5
A knob or handle that controls the stops of an organ.

From Latin manubrium (“handle”).