| Arnotto | /mhw>, n. [ Perh. the native name. ] A red or yellowish-red dyeing material, prepared from the pulp surrounding the seeds of a tree (Bixa orellana) belonging to the tropical regions of America. It is used for coloring cheese, butter, etc. [ Written also Anatto, Anatta, Annatto, Annotta, etc. ] [ 1913 Webster ] Variants: Annotto |