| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| tertial |
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| SYLLABICATION: | ter·tial |
| PRONUNCIATION: |  tûr sh l |
| ADJECTIVE: | Of, relating to, or designating the third row of flight feathers on the basal section of a bird's wing. | | NOUN: | A tertial feather. | | ETYMOLOGY: | Latin tertius, third; see tertiary + –al1.
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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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