Rib (noun)

1. One of a series of curved bones that are attached to the vertebral column and protect the thorax in humans and other mammals.
2. A cut of meat from the side of an animal between the spine and the ribs.
3. A thing that resembles the shape of a rib, such as a curved piece of metal used in construction.
4. A structure in an aircraft or other vehicle that reinforces a surface.

Origin:

Old english rīb, of germanic origin; related to dutch rib and german rippe.

Examples:

1. He broke a rib in the accident.
2. The steak came with a bone, a rib.
3. The ribs of the umbrella.
4. The ribs of the airplane.
5. The rib of the boat.