actiniohematin

noun

ac·​tin·​i·​o·​he·​ma·​tin

ak-¦ti-nē-(ˌ)ō-ˈhē-mə-tən

plural -s

: a respiratory pigment obtained from a sea anemone (Actinia equina) and now considered to be a mixture of cytochromes

Word History

Etymology

actinio- + hematin

First Known Use

circa 1899, 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!