GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Soy (soi), Soya (soiȧ), n. [Chinese shōyū.]
   1. A Chinese and Japanese liquid sauce for fish, etc., made by subjecting boiled beans (esp. soybeans), or beans and meal, to long fermentation and then long digestion in salt and water.
   
   [1913 Webster]
   
   
   2. (Bot.) The soybean.
   
   [1913 Webster +PJC]