Heptad
/ˈhɛptæd/noun
A group or set of seven.
Did you know?The Greek root behind heptad is the same ancient number-root preserved in English words such as seven and September.
Etymological Timeline
Proto-Indo-European
PIE
*septḿ̥
“Seven”
Ancient Greek
Greek
ἑπτά (hepta)
“Seven”
Ancient Greek
Greek
ἑπτάς (heptas)
“A group or set of seven”
Late Latin
Latin
heptas
“A group of seven; a Greek-derived scholarly term”
17th Century
English
heptad
“A group or set of seven”
Explore more surprising origins