Definition of: soy

(soi) noun
1. A small, erect herb (Glycine soja) of the bean family, growing in India and China and cultivated for forage.
2. Its edible bean, a source of oil, flour, and other products: also soy·a (soi′ə), soy′bean′.
3. A sauce prepared in China and Japan from soybeans that have been fermented and steeped in brine: also soy sauce. [<Japanese soy, shoy, short for shōyū soy]