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“caliduct”
caliduct, caleduct (noun); caliducts, caleducts
A pipe for the conveyance of heat by means of steam, hot water, or air; used by the ancient Romans for the distribution of warmth to several remote parts of their houses, from one common furnace.
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duc-, -duce, -duct, -ducent, -ductor, -duction, -ductive, -ducer, -ducement, -ducation
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