1. A purple dye obtained from several lichens. Litmus-paper, unsized paper stained with litmus, which is used as a delicate test of acidity.

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

• limus,
• lioms,
• litium,
• limts,
• itmes,
• litmuz,
• lithmus,
• lettus,
• litles,
• litmous,
• lstmus,
• litus,
• littmus,
• litmuss,
• lytmus,
• litodomus,
• lithodmus,
• lituy,
• Littus,
• littimus

The adjective form of the word "litmus" is "litmotic".

The plural form of "litmus" is "litmuses".

The singular form of the word "litmus" is "litmus".