soy meaning
Definition of soy. 1 : a brown liquid sauce made by subjecting beans (such as soybeans) to long fermentation and to digestion in brine.
soy, soybean, soya bean (noun) a source of oil; used for forage and soil improvement and as food soy, soya, soybean, soya bean, soybean plant, soja, soja bean, Glycine max (noun)