Coccyx (noun)

The triangular bone at the lower end of the vertebral column in humans and many other primates, typically composed of four fused vertebrae.

Origin:

Latin, from greek kokkyx, cuckoo, because of its supposed resemblance to the tail of a cuckoo.

Examples:

1. I fell and broke my coccyx, which caused a lot of pain and difficulty sitting.
2. The coccyx is sometimes referred to as the tailbone.
3. A coccyx injury can result from a fall or sudden impact to the lower back.
4. In some cases, surgery may be necessary to correct a painful or dislocated coccyx.
5. The coccyx serves as the attachment point for several muscles and ligaments in the lower back.