| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| hadal |
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| SYLLABICATION: | ha·dal |
| PRONUNCIATION: | h d l |
| ADJECTIVE: | Of or relating to the deepest regions of the ocean, below about 6,000 meters (20,000 feet). | | ETYMOLOGY: | French, from Hadès, Hades, from Greek Haid s. See weid- 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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