wet return

noun

: a pipeline in a steam heating system for returning water of condensation to the boiler that being located below the waterline of the boiler can contain only water rather than the steam mixed with water which a return pipe located above the waterline may contain

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!