1. Kyanite, so called from its unequal hardness, and because its crystals can be electrified both positively and negatively.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sisthene,
• xisthene,
• cisthene,
• fisthene,
• risthene,
• eisthene,
• dusthene,
• djsthene,
• dksthene,
• dosthene,
• d9sthene,
• d8sthene,
• diathene,
• diesthene,
• Dysthene,
• Desthene,
• Dysthine,
• Disteine,
• Discthene,
• Disthine

The plural of the "Disthene" can be the "disthenes".

The singular of the "Disthene" can be the "Disthene".