plenum chamber

noun

a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber (plenum chamber) at a pressure slightly higher than atmospheric pressure, so as to expel foul air.

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Origin:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Plenum chamber is always a great word to know.

So is callithumpian. Does it mean:

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

a scrap or morsel of food left at a meal.

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plenum chamber

plenum ventilation