Etymology

tous-les-mois

Today it means: A kind of starch with large, oval, flattened grains, often sold as arrowroot or used for adulterating cocoa, made from the rootstocks of a species of Canna, probably Canna edulis. Full definition →

French tous les mois
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The story

  1. French · derived fromtous les mois“all the months, i.e. every month”
  2. English todaytous-les-mois

From French tous les mois (“all the months, i.e. every month”), since the tubers of the plant are edible throughout the year.

Etymology from Wiktionary, CC BY-SA 4.0.