annotto \annot"to\ a^nno^t"t-o, arnotto \arnot"to\
   aumrno^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
see also:
bixa orellana anatto anatta annatto annotta