buckwheat

noun

any of several plants (genus Fagopyrum) of the buckwheat family, grown for their black, triangular grains
the grain of this plant, from which a dark flour is made
☆ this flour

adjective

designating a family (Polygonaceae, order Polygonales) of dicotyledonous plants, including rhubarb, dock, and sorrel

See buckwheat in American Heritage Dictionary 4

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