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From The Collaborative International Dictionary of English v.0.48:
Annotto \An*not"to\ ([a^]n*n[o^]t"t[-o]), Arnotto \Ar*not"to\ ([aum]r*n[o^]t"t[-o]), 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]