a bottle or flask having a vacuum liner that prevents the escape of heat from hot contents, usually liquids, or the entrance of heat into cold contents; thermos.
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Origin of vacuum bottle
First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A container with a double wall and a partial vacuum in the space between the two walls. Vacuum bottles are used to minimize the transfer of heat between the inside and the outside and thus keep the contents at a desired temperature.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.