surface mail
Americannoun
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the system, especially a government postal system, of sending mail by truck, train, or boat, as opposed to airmail.
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mail sent by this system.
noun
Example Sentences
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The distinction resembles the difference between a cell phone conversation at the speed of light and the exchange of letters through surface mail.
From Scientific American
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.