mental
adjective(men-tal)
of or relating to the chin or median part of the lower jaw
mental
adjective(men-tal)
affected by a disorder of the mind
Examples:
A mental patient. 
Mental illness. 
mental
adjective(men-tal)
involving the mind or an intellectual process
Examples:
Mental images of happy times. 
Mental calculations. 
In a terrible mental state. 
Mental suffering. 
Free from mental defects. 
mental
adjective(men-tal)
of or relating to the chin- or liplike structure in insects and certain mollusks
mental
(men-tal)
of or relating to the mind
Examples:
Mental powers. 
Mental development. 
Mental hygiene.