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WordNet-Online 
 Definitions from WordNet
Noun frontal sinus has 1 sense | ||||
| Definitions from the WebFrontal SinusPart of Speech: Noun Definition: One of the paired air-filled cavities located within the frontal bone of the skull, above the eyes and behind the forehead. Senses: 
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| frontal cortex frontal eminence frontal gyrus frontal lobe frontal lobe of cerebrum frontal lobes frontal lobotomy frontal scapula frontal sinus frontal suture frontally frontbencher frontbenchers frontera fronti frontier-dissolving frontier 
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