[f. (app. by Wotton) L. cali-dus hot, or cal-or heat + ductus, after AQUEDUCT. Cf. F. caliduc (in the Academy’s Dict. 1801).] A duct or pipe for the conveyance of heat by means of steam, hot water, or air.
1651. Reliq. Wotton., 254. Pipes … transporting heate to sundry parts of the House from one common Furnace … I am ready to baptize them Caliducts as well as they are termed Venti-ducts and Aqua-ducts that convey winde and water.
1664. Evelyn, Kal. Hort. (1729), 228. Since the Subterranean Caliducts have been introduced … the most tender … Plants … did outlive … those rigorous Seasons.
1753. Chambers, Cycl. Supp., s.v., The ancient caliducts.
1863. Draper, Intell. Devel. Europe, xvi. (1865), 348. Earthen pipes, or caleducts, imbedded in the walls.
