What is the meaning of soy?

noun

• A source of oil; used for forage and soil improvement and as food.
  • synonyms: soybean, soya bean
• Erect bushy hairy annual herb having trifoliate leaves and purple to pink flowers; extensively cultivated for food and forage and soil improvement but especially for its nutritious oil-rich seeds; native to Asia.
  • synonyms: soya, soybean, soya bean, soybean plant, soja, soja bean, Glycine max
• Thin sauce made of fermented soy beans.
  • synonyms: soy sauce
• 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. ).
  • synonyms: soybean, soya, soya bean