Cir″cu‐la‐to‐ry, n. A chemical vessel consisting of two portions unequally exposed to the heat of the fire, and with connecting pipes or passages, through which the fluid rises from the overheated portion, and descends from the relatively colder, maintaining a circulation.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.