1. Dark red silver ore; it is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black colour with a metallic adamantine lustre
   - pyrargyrite 
2. A sulphide of arsenic and silver of a beautiful cochineal-red colour, occurring in rhombohedral crystals, and also massive
   - proustite

Derived forms: ruby silvers

• running hand
• running head
• running headline
• running light
• running mate
• running noose
• running pine
• running play
• running pop
• running postman
• running shoe
• running start
• running stitch
• running suit
• running time
• running title
• runny
• runoff
• runproof
• runt
• runtiness
• runty
• runup
• runway
• Runyon