Tous-les-mois n.  A kind of starch with very large, oval, flattened grains, often sold as arrowroot, and extensively used for adulterating cocoa. It is made from the rootstocks of a species of Canna, probably Canna edulis, the tubers of which are edible every month in the year.
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  Canna edulis
       n : canna grown especially for its edible rootstock from which
           arrowroot starch is obtained [syn: achira, indian shot,
            arrowroot, Canna indica]