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heptane
heptarch
Heptarchy
heptarchy
heptastich
Heptateuch
heptathlon
heptatonic
heptavalent
heptose
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heptavalent
hep·ta·va·lent [ hèptə váylənt ]


adjective 
Definition:
 
with valence of seven: used to describe a chemical element that has a valence of seven
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