1) Anterior 
• (n.) A prefrontal bone or scale. • (a.) 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.
(pre-fron´tәl) situated in the anterior part of the frontal region or lobe. the central part of the ethmoid bone.
Pre·fron'tal adjective (Anat. & Zoology) 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. -- noun A prefrontal bone or scale. 
Type: Term Pronunciation: prē-frŏn′tăl Definitions: 1. Denoting the anterior portion of the frontal lobe of the cerebrum. 2. Denoting the granular frontal cortex rostral to the premotor area.
[adj] - anterior to a frontal structure
adjective anterior to a frontal structure; `a prefrontal bone`; `prefrontal lobes`
anterior to, situated in, or pertaining to the anterior part of a frontal structure.