Webster's English Dictionary

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parietal

pa.ri.etal \p*-'ri--*t-*l\ aj 1a: of or relating to the walls of a part or 
   cavity  1b: of, relating to, or forming the upper posterior wall of the 
   head  2: attached to the main wall rather than the axis or a cross wall of 
   an ov ary - used of an ovule or a placenta 3: of or relating to life within 
   college walls or its order and regulation  - parietal n