See Also: heptad(medicine)
heptad(dictionary)
heptad repeat(medicine)

heptad (iou)



heptad noun. M17.
[Greek heptad-, heptas, from hepta seven: see -AD1.]
A group of seven. M17.
spec. = HEBDOMAD 2. L19.
Chemistry. A heptavalent element or group. Only in L19.