平へい行こう四し辺へん形けいへいこうしへんけいMeanings1nounparallelogramgeometryA quadrilateral with two pairs of parallel sides. Used in geometry contexts.平へい行こう四し辺へん形けいの面めん積せきは底てい辺へん×高たかさで求もとめられます。The area of a parallelogram is found by base × height.