Also means
mandible
Usage Note
Unterkiefer is the lower jawbone, the only movable bone of the skull. Unterkieferbruch (mandible fracture) and Unterkiefergelenk (temporomandibular joint) appear in dental and ENT contexts regularly.
Examples
"Das Röntgenbild zeigte einen Haarriss im Unterkiefer."
Natural Translation
The X-ray showed a hairline fracture in the lower jaw.
Literal Translation
The X-ray showed a hairline crack in the lower jaw.

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