heptad
Example Sentences
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Ten minutes later we arrive at 257 Heptad Lane.
From "Counting by 7s" by Holly Goldberg Sloan
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Heptad, a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven.
From The Nuttall Encyclopædia Being a Concise and Comprehensive Dictionary of General Knowledge by Nuttall, P. Austin