octad

• 名词，指由八个组成的一组或一套；也可表示数量八，即七加一的和。

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.

   八个一组

   • 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.

   同义词eightsomeoctetogdoad

2. The number eightC1formal

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

   八

   • 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.

   同义词eightoctet