octad

• Существительное, обозначающее группу или набор из восьми, или количественное числительное, являющееся суммой семи и одного.

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.

   Восьмёрка

   • 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.

   Synonymseightsomeoctetogdoad

2. The number eightC1formal

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

   Восьмёрка

   • 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.

   Synonymseightoctet