platiniridium

noun

plat·​in·​iridium

¦platᵊn+

: a mineral consisting of a natural alloy of iridium with platinum and other related metals occurring usually in silver-white grains (hardness 6–7, specific gravity, 22.6–22.8)

Word History

Etymology

platin- + iridium

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!