heptad

名词 heptad:

1. the cardinal number that is the sum of six and one
   同义词：seven, 7, VII, sevener, septet, septenary

hep.tad

n.（名词）
A group or series of seven.
七个一套，七个一组：成七的一组或一套

来源：
Greek heptas heptad- [the number seven]
希腊语 heptas heptad- [数字七]
from hepta [seven] * see septô
源自 hepta [七] *参见 septô