Mental

Part of speech: noun (n.)

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

Part of speech: adjective (a.)

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

Part of speech: adjective (a.)

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.