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Kitniyot (Hebrew: קִטְנִיּוֹת, qitniyyot) is a Hebrew word meaning legumes. During the Passover holiday, however, the word kitniyot (or kitniyos in some dialects) takes on a broader meaning to include grains and seeds such as rice, corn, sunflower seeds, and sesame seeds, in addition to legumes.
For more see here.