Source : Webster's Revised Unabridged Dictionary (1913)

Tous-les-mois \Tous`-les`-mois"\, n. [F., all the months, i.e.,
   every month.]
   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 {C. edulis}, the tubers of which
   are edible every month in the year.

Canna \Can"na\, n. [It.]
   A measure of length in Italy, varying from six to seven feet.
   See {Cane}, 4.

Canna \Can"na\, n. [L., a reed. See {Cane}.] (Bot.)
   A genus of tropical plants, with large leaves and often with
   showy flowers. The Indian shot ({C. Indica}) is found in
   gardens of the northern United States.

Source : WordNet®

canna
     n : any plant of the genus Canna having large sheathing leaves
         and clusters of large showy flowers