φρήν
phrḗn
frane
probably from an obsolete Greek word not found in the New Testament (to rein in or curb; compare φράσσω); the midrif (as a partition of the body), i.e. (figuratively and by implication, of sympathy) the feelings (or sensitive nature; by extension (also in the plural) the mind or cognitive faculties).

KJV translates as: understanding