adj.
Pronunciation: h ī - ' drä-nik
Function: adjective
Etymology: hydr- + -onic (as in electronic )
Date: 1946
: of, relating to, or being a system of heating or cooling that involves transfer of heat by a circulating fluid (as water or vapor) in a closed system of pipes
– hy · dron · i · cal · ly \ -ni-k( ə -)l ē \ adverb