The Collaborative International Dictionary of English v.0.48:
Soja \So"ja\ (s[=o]"j[.a] or s[=o]"y[.a]), n. (Bot.)
An Asiatic leguminous herb (Glycine max, formerly Glycine
Soja) the seeds of which (called soy beans) are used in
preparing the sauce called soy. Called also soya.