octad

• Substantivo que designa um grupo ou conjunto de oito; também o número cardinal resultante da soma de sete com um.

A noun referring to a group or set of eight, or the cardinal number that is the sum of seven and one.

1. Group of eightC1formal

   A set or collection of eight things or people.

   Grupo de oito

   • The octad of musicians performed a complex symphony.
   • In chemistry, an octad refers to a group of eight atoms.
   • The octad of planets in our solar system was once a common classification.

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2. The number eightC1formal

   The cardinal number that is the sum of seven and one.

   O número oito

   • An octad is equivalent to two tetrads.
   • The ancient Greeks considered the octad a symbol of harmony.
   • The octad is the base of the octal number system.

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