annatto

Concise Oxford English Dictionary © 2008 Oxford University Press:
annatto /əˈnatəʊ/ (also anatto)

▶noun (pl. annattos)

• 1 an orange-red dye obtained from the seed coat of a tropical fruit, used for colouring foods.

• 2 the tropical American tree from which annatto is obtained. [Bixa orellana.]

– origin C17: from Carib.