名詞 pentad:

1. the cardinal number that is the sum of four and one
   同義詞：five, 5, V, cinque, quint, quintet, fivesome, quintuplet, fin, Phoebe, Little Phoebe

pen.tad

n.（名詞）
A group of five.
五個一組

來源：
Greek pentas pentad- [group of five]
希臘語 pentas pentad- [五個一組]
from pente [five] * see penk we
源自 pente [五] *參見 penk we