Endoskeleton (noun)

1. An internal skeleton, as found in vertebrates and some invertebrates, that provides support and protection for the body.
2. A skeleton that is located inside the body and forms the structural framework of an organism.

Origin:

From the greek word "endo" which means "within" and "skeleton".

Examples:

1. The human body has an endoskeleton that provides support and protection for the internal organs.
2. Fish and amphibians have endoskeletons made of cartilage.
3. The endoskeleton of the shark is made of cartilage.
4. The endoskeleton of the crab is made of chitin.
5. The endoskeleton of a snake is made of bony segments called vertebrae.