Dictionary.net

• Soluble starch; the soluble contents or vanilla of the starch granule; a carbohydrate, (C12H10O20)54.

1900 - A dictionary of medicine and the allied sciences
By Alexander Duane

• Soluble starch, formed by heating starch grains with water or very dilute acids.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe