soybean(n = noun.food) soy, soya, soya bean - the most highly proteinaceous vegetable known; the fruit of the soybean plant is used in a variety of foods and as fodder (especially as a replacement for animal protein);
An Asiatic leguminous herb (Glycine max, formerly Glycine Soja) the seeds of which (also called soy beans) are used in preparing the sauce called soy. Called also soya bean and soya. [1913 Webster]
the seeds of the Glycine max, which produce soybean oil; -- called also soya bean. [PJC]