occipital bone

This term is a precise anatomical designation used primarily in medical, biological, and forensic contexts. It describes a specific structural component of the cranium, and as such, it carries a neutral, clinical tone. It is rarely used in casual conversation unless referring to a specific injury or medical condition.

Because this refers to a unique, singular anatomical structure within a single human skull, it is typically treated as a countable noun in a general biological sense (e.g., comparing the occipital bones of different species), but in a clinical context regarding a single patient, it is almost always used in the singular.