1) A usually translucent somewhat elastic tissue that composes most of the skeleton of vertebrate embryos and except for a small number of structures (as some joints, respiratory passages, and the external ear) is replaced by bone during ossification in the higher vertebrates.

2) A part or structure composed of cartilage.

3) A tough, flexible tissue that lines joints and gives structure to the nose, ears, larynx, and other parts of the body.