PENTAD


Meaning of PENTAD in English

ˈpen.ˌtad noun

( -s )

Etymology: Greek pentad-, pentas, from pente five — more at five

1.

a. : a group of five

b. : a period of five days

2. : a pentavalent element, atom, or radical

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.