What does the word cube mean?

Usage examples for cube

  1. Now they were clear before us, and now we could see the surface of the cube on which they rode. – The Metal Monster by A. Merritt
  2. They ate cube sugar, which they called " hard stuff", and they injected molasses syrup into their veins with hypos and called this " mainliners." – Mars Confidential by Jack Lait Lee Mortimer