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heptad

[hep-tad]

noun

the number seven.

a group of seven.

Chemistry. an element, atom, or group having a valence of seven.

Origin:
1650–60; < Greek heptad- (stem of heptás). See hepta-, -ad¹

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Heptad is always a great word to know.

So is retort. Does it mean:

a vessel, commonly a glass bulb with a long neck bent downward, used for distilling or decomposing substances by heat

a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation

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Collins

World English Dictionary

heptad (ˈhɛptæd)

—n
1.	a group or series of seven
2.	the number or sum of seven
3.	an atom or element with a valency of seven

[C17: from Greek heptas seven]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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heptad

hep·tad