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Prefrontal \Pre*fron"tal\, a. (Anat. & Zo["o]l.) Situated in front of the frontal bone, or the frontal region of the skull; ectethmoid, as a certain bone in the nasal capsule of many animals, and certain scales of reptiles and fishes. -- n. A prefrontal bone or scale.
prefrontal adj : anterior to a frontal structure; "a prefrontal bone"; "prefrontal lobes"