/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 ]
[ After N. L. S. Carnot, French physicist. ] (Thermodynamics) An ideal heat-engine cycle in which the working fluid goes through the following four successive operations: (1) Isothermal expansion to a desired point; (2) adiabatic expansion to a desired point; (3) isothermal compression to such a point that (4) adiabatic compression brings it back to its initial state. [ Webster 1913 Suppl. ]