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Pentad

//ˈpɛnˌtæd// noun

Noun

1
Synonym of quintet: A group of five things, particularly; Synonym of quinquennium: a five-year period, especially in reference to the first and second halves of calendrical decades.
2
the cardinal number that is the sum of four and one wordnet
3
Synonym of quintet: A group of five things, particularly; A five-day period, especially a temperature average taken every five days.
4
Synonym of quintet: A group of five things, particularly; A five-day division of the Chinese calendar, forming part of a solar term (Chinese: 候).
5
Synonym of quintet: A group of five things, particularly; A pentavalent element or group: an atom or molecule with a valence of five, comparable with five atoms of hydrogen.
"Nitrogen is a pentad in the ammonium compounds."

From Ancient Greek πεντάς (pentás), from πέντε (pénte, “five”) + -άς (-ás, “-ad”). By surface analysis, pent- + -ad.

Unscramble this word: pentad