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DictionaryRoot: kybos
Greek

kybos

six-sided die

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A single solid wooden cube shown in three-quarter view, with three visible square faces and clearly equal edge lengths, directly illustrating the cube-shaped branch of the frozen meaning.
adjective

cubic

KYOO-bik/ˈkjuːbɪk/

Relating to a cube and its three-dimensional measure.

Etymology
cubGreekcube, six-sided die
+icGreekconnected with or characteristic of

The cube takes its name from a six-sided die, whose shape supplied the geometric image. In measurements, 'cubic' extends that three-dimensional idea to units of volume.

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