📖 Definitions of "Pentad"
noun
- 1
A group or series of five things.
- 2
A mean average value of temperature, etc., taken every five days.
- 3
Any element, atom, or radical having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad.
"Nitrogen is a pentad in the ammonium compounds."
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