perpendicular plate

noun
per·pen·dic·u·lar plate | \ˌpər-pən-ˈdik-yə-lər- \

Medical Definition of perpendicular plate 

1 : a flattened bony lamina of the ethmoid bone that is the largest bony part assisting in forming the nasal septum

2 : a long thin vertical bony plate forming part of the palatine bone — compare horizontal plate

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