/euh nat"oh, euh nah"toh/ , n. , pl. annattos .
1. a small tree, Bixa orellana, of tropical America.
2. Also, arnatto . a yellowish-red dye obtained from the pulp enclosing the seeds of this tree, used for coloring fabrics, butter, varnish, etc.
Also, anatto . Also called achiote .
[ 1675-85; ]