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heptastich
Heptateuch
heptathlon
heptatonic
heptavalent
heptose
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heptagon
hep·ta·gon [ héptə gòn ] (plural hep·ta·gons)


noun 
Definition:
 
seven-sided shape: a two-dimensional geometric figure formed of seven angles and seven sides
[Late 16th century. Directly or via French< medieval Latin heptagonum< Greek heptagōnos "having seven angles"]

hep·tag·o·nal [ hep tággən'l ] adjective
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