GNU Collaborative International Dictionary of English

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1.       
   Annotto , Arnotto , 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