Answer: CAGE

In a general sense, a cage refers to a structure made of bars or wires that is used to confine or contain something. It can be used to keep animals or birds enclosed, or to provide protection or security for humans. In the context of the clue "rib structure," a cage can specifically refer to a framework or support structure that resembles the arrangement of ribs. This could be seen in structures such as bird cages, certain types of construction scaffolding, or even the internal structure of some objects, like the ribs of an umbrella. The ribs in a cage-like structure typically provide support and strength while allowing for some degree of flexibility.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: "National Treasure" star. Explanations are generated by AI and may be inaccurate.