| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| heyday |
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| SYLLABICATION: | hey·day |
| PRONUNCIATION: | h d  |
| NOUN: | The period of greatest popularity, success, or power; prime. | | ETYMOLOGY: | Perhaps alteration of heyda, exclamation of pleasure, probably alteration of Middle English hey, hey.
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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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