Definition of heptad in English:

heptad

noun

technical
  • A group or set of seven.

    • ‘The zipper was positioned either immediately after the heads or following 15 heptads of native sequence.’
    • ‘In fibrous proteins, the coiled coil structures can be many heptads long.’
    • ‘The amino acids in the heptad repeats that constitute the predicted coiled-coil regions are underlined.’
    • ‘Coiled coils commonly contain a heptad of residues labeled A-G, repeated at least three or four times.’
    • ‘Add vowels to create words, then delete this heptad of words.’

Origin

Mid 17th century: from Greek heptas, heptad-, from hepta ‘seven’.

Pronunciation

heptad

/ˈhɛptad/