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Wiktionary
hard palate

n. A thin horizontal bony plate of the skull, located in the roof of the mouth.

WordNet
hard palate

n. the bony part of the roof of the mouth

Wikipedia
Hard palate

The hard palate is a thin horizontal bony plate of the skull, located in the roof of the mouth. It is formed by the palatine process of the maxilla and horizontal plate of palatine bone, and spans the arch formed by the upper teeth.