In the context of biology, the term 'bones united by hyaline cartilage' refers to a type of joint known as a synchondrosis. Synchondroses are cartilaginous joints where the bones are joined together by hyaline cartilage, a smooth, glass-like connective tissue that provides support and flexibility.
These types of joints are typically found in areas of the body that require some flexibility and shock absorption while still maintaining strength and stability. An example of a synchondrosis is the epiphyseal plates, or growth plates, found in growing children and adolescents. These plates allow for the lengthwise growth of long bones.
Synchondroses are mostly temporary and ossify, or harden into bone, as the individual ages. Once ossification is complete, these joints become synostoses, where the bones are permanently joined together without any cartilage remaining.
In summary, bones united by hyaline cartilage form synchondroses, which are temporary joints important for bone growth and development.