a, d, e, p, h, t are letters that make 'heptad'
he, ad, He, tad, hep, AD, Pt, Ta are words within 'heptad'
heptads is a word created by adding a letter to 'heptad'
1 possible definitions for 'heptad'
Under this definition, heptad is a noun and has the following properties:
7, septet, seven, VII, sevener, septenary have the same meaning as 'heptad'
'heptad' can be a type of digit, figure.
seven, 7, vii are derivatives of 'heptad'.