Mental \Men"tal\, a. [L. mentum the chin.]

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

Source: Webster's Revised Unabridged Dictionary (1913)
 

Mental \Men"tal\, n. (Zo["o]l.) A plate or scale covering the mentum or chin of a fish or reptile.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Mental \Men"tal\, 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 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.

Source: Webster's Revised Unabridged Dictionary (1913)