Definition of xenotime
: a mineral YPO4 that is a phosphate of yttrium occurring in usually brown or yellow tetragonal crystals and rolled grains and that often also contains thorium, erbium, cerium, or other elements (hardness 4–5, specific gravity 4.45–4.56)
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!
Origin and Etymology of xenotime
French xénotime, irregular (influence of xén- xen-) from Greek kenos empty, vain + timē honor; from the fact that it was wrongly thought at first to contain a new metal
Seen and Heard
What made you want to look up xenotime? Please tell us where you read or heard it (including the quote, if possible).