tæd noun
1.
the number seven.
2.
a group of seven.
3.
Chemistry. an element, atom, or group having a valence of seven.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source
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Link To heptad
Collins
World English Dictionary
heptad (ˈhɛptæd) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —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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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Heptad
is always a great word to know.
So is combustion. Does it mean:
| rapid oxidation accompanied by heat and light, or a chemical combination attended by production of heat and light |
| existing as free, uncombined atoms |
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