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From: Webster's Revised Unabridged Dictionary (1913)

 Cube n.
 1. Geom. A regular solid body, with six equal square sides.
 2. Math. The product obtained by taking a number or quantity three times as a factor; as, 4x4=16, and 16x4=64, the cube of 4.
 Cube ore Min., pharmacosiderite. It commonly crystallizes in cubes of a green color.
 Cube root. Math., the number or quantity which, multiplied into itself, and then into the product, produces the given cube; thus, 3 is the cube root of 27, for 3x3x3 = 27.
 Cube spar Min., anhydrite; anhydrous calcium sulphate.