Buckwheat

·noun The triangular seed used, when ground, for griddle cakes, ·etc.

II. Buckwheat ·noun A plant (Fagopyrum esculentum) of the Polygonum family, the seed of which is used for food.

buckwheat
A species of grain (genus polygonor), the flour of which is much used in the United States. An etym...

Dictionary of American Words And Phrases by John Russell Bartlett.