a room or enclosure where animals may be killed by exposure to a poison gas.
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Origin of lethal chamber
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for lethal chamber
This is to be used for the “lethal-chamber,” where the specimens are to be sent to sleep, but not to “awake refreshed.”Three Hundred Things a Bright Boy Can Do|Anonymous