Assertion: coccyx | /r/Synonym | the tailbone.﻿﻿ fusion
Facets:
value: colloquially
type: DEGREE
Source sentences:
text: The last three to five (usually four) vertebrae of the spinal column are fused together to make the coccyx, colloquially known as the tailbone.﻿﻿ Fusion begins during a person's 20s and is usually complete by the age of 30.