heptad
[ hep-tad ]
noun
the number seven.
a group of seven.
Chemistry. an element, atom, or group having a valence of seven.
Origin of heptad
1Words Nearby heptad
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use heptad in a sentence
But this oddness belongs to other numbers also (pentad, heptad, &c.).
Aristotle | George Groteheptad, a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven.
The Nuttall Encyclopaedia | Edited by Rev. James Wood
British Dictionary definitions for heptad
heptad
/ (ˈhɛptæd) /
noun
a group or series of seven
the number or sum of seven
an atom or element with a valency of seven
Origin of heptad
1C17: from Greek heptas seven
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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