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hydronic

[hahy-dron-ik]
adjective
  1. of or relating to a heating system for a building in which the medium for carrying heat throughout the structure is circulating water, especially when the circulation is aided by a pump.
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Origin of hydronic

1945–50; probably hydr-1 + (electr)onic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018