An·not·to Ar·not·to, n. 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.]
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A·nat·to n. Same as Annotto.
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