Coccyx

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** A small bone located at the bottom of the spine. The coccyx is a result of 3-5 fused rudimentary vertebrae.

**Synonyms:** - COCCYX - coccygeal skeleton - coccygeal vertebrae I-IV - coccyx - coccyx - fused caudal vertebrae - fused caudal vertebral column - os coccygis - tailbone - vertebrae coccygeae I-IV