Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to a heating or cooling system that transfers heat by circulating a fluid through a closed system of pipes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Refers to heating systems which involve circulating hot water or steam.

Etymologies

hydr(o)- + -onic (as in electronic).
(American Heritage® Dictionary of the English Language, Fourth Edition)
blend of hydro- and -onic (Wiktionary)

Examples

Comments

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