| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| heptad |
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| SYLLABICATION: | hep·tad |
| PRONUNCIATION: | h p t d |
| NOUN: | A group or series of seven. | | ETYMOLOGY: | Greek heptas, heptad-, the number seven, from hepta, seven. See sept in Appendix I.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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