heap roasting

noun

variants or heap roast

: a process in which high-sulfur ore piled in the open is roasted without fuel other than for ignition, the heat being furnished by the combustion of the sulfur in the ore

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!