Webster's Revised Unabridged Dictionary · 1913

Mental

Mental , a.

[L. mentum the chin.]

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

Mental , n.

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

Mental , a.

[F., fr. L. mentalis, fr. mens, mentis, the mind; akin to E. mind. See Mind.]

Of or pertaining to the mind; intellectual; as, mental faculties; mental operations, conditions, or exercise.
What a mental powerb This eye shoots forth! — Shakespeare