- affected by a disorder of the mind
"a mental patient"
"mental illness"

- involving the mind or an intellectual process
"mental images of happy times"
"mental calculations"
"in a terrible mental state"
"mental suffering"
"free from mental defects"

- of or relating to the chin or median part of the lower jaw

- of or relating to the chin- or lip-like structure in insects and certain mollusks

- of or relating to the mind
"mental powers"
"mental development"
"mental hygiene"

1. Of or pertaining to the chin; genian; as, the mental nerve; the mental region.

1. A plate or scale covering the mentum or chin of a fish or reptile.

1. Of or pertaining to the mind; intellectual; as, mental faculties; mental operations, conditions, or exercise.

"What a mental power This eye shoots forth!" -- Shak.

Mental alienation
insanity.

Mental arithmetic
the art or practice of solving arithmetical problems by mental processes, unassisted by written figures.