heptad
[ hep-tad ]
/ ˈhɛp tæd /
noun
the number seven.
a group of seven.
Chemistry.
an element, atom, or group having a valence of seven.
Words nearby heptad
hepped,
hepplewhite,
hepta-,
heptachlor,
heptachord,
heptad,
heptadecanoic acid,
heptagon,
heptagonal,
heptahedron,
heptahydrate
Example sentences from the Web for heptad
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
Word Origin for heptad
C17: from Greek
heptas seven