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Webster's 1913 Dictionary

PREFRONTAL

PREFRONTAL Pre *fron "tal, a. (Anat. & Zoöl.)

Defn: 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.

Defn: A prefrontal bone or scale.

New American Oxford Dictionary

prefrontal

pre fron tal |prēˈfrəntl priˈfrəntl | ▶adjective [ attrib. ] 1 Anatomy in or relating to the foremost part of the frontal lobe of the brain: the prefrontal cortex. 2 Zoology relating to or denoting a bone in front of the eye socket in some lower vertebrates (equivalent to part of the human ethmoid bone ). ▶noun Zoology a prefrontal bone.

Oxford Dictionary

prefrontal

pre |front ¦al |priːˈfrʌnt (ə )l | ▶adjective 1 Anatomy in or relating to the foremost part of the frontal lobe of the brain: the prefrontal cortex. 2 Zoology relating to or denoting a bone in front of the eye socket in some lower vertebrates (equivalent to part of the human ethmoid bone ). ▶noun Zoology a prefrontal bone.