soy flour

This finely ground flour is made from soybeans and, unlike many flours, is very high in protein (twice that of wheat flour) and low in carbohydrates. Soy flour is ordinarily mixed with other flours rather than being used alone. It has a wide variety of uses such as for baking and to bind sauces. In Japan, it's very popular for making confections. Soy flour is sold in natural food stores-sometimes under the name kinako-and in some supermarkets.

The noun has one meaning:

Meaning #1: meal made from soybeans
  Synonyms: soybean meal, soybean flour