Achromatium

noun

Ach·​ro·​ma·​ti·​um

ˌa-krə-ˈmā-shē-əm

: the type genus of the family Achromatiaceae

Word History

Etymology

New Latin, from achromat- + -ium

First Known Use

1894, in the meaning defined above

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!