noun, plural ar·nat·tos.
Examples from the Web for arnatto
If the colours be wanted of a deeper cast, arnatto or dragon's blood may be added to the tincture.
Some of the men also smear their bodies with arnatto, as do the women.The Western World|W.H.G. Kingston
Put into a pint of alcohol, an ounce of turmeric powder, two drams of arnatto, and two drams of saffron.
Nankeen is obtained from Spanish arnatto dissolved in hot water, with a small portion of pearlash in it.Mrs. Hale's Receipts for the Million|Sarah Josepha Hale