Webster's Revised Unabridged Dictionary · 1913

Heating

Heating (hēt"ing) , adjective

That heats or imparts heat; promoting warmth or heat; exciting action; stimulating; as, heating medicines or applications.
Collocations (1)
Heating surface (Steam Boilers) , the aggregate surface exposed to fire or to the heated products of combustion, esp. of all the plates or sheets that are exposed to water on their opposite surfaces; -- called also fire surface.