Definition
Being 'cartilaginous' means something is made of cartilage, the flexible tissue found in your ears and nose ðð. Cartilage is less rigid than bone but provides support. Think of it as a shock absorber in your joints. Sharks are 'cartilaginous' fish because their skeletons aren't bone. Cartilage allows for flexibility and movement. It's like the difference between a sturdy tree trunk (bone) and a bendy branch (cartilage).