| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| infra |
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| PREFIX: | Inferior to, below, or beneath: infrasonic. | | ETYMOLOGY: | From Latin nfr , below. See dher- 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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