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hepta-, hept- (Greek: seven; used as a prefix).


heptachord:
heptachromic:
heptad:
heptadactylism:
heptagon:
heptagynous:
heptahedron:
heptahydrate:
heptaldehyde:
heptameter:
heptandrous:
heptangular:
heptarchy:
heptatonic: