V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry रेतम्
रेतम्retamSemen virile.
Semen virile.
Derived forms and compounds
-जम् an offspring or child; रेतजो वा भवेत् पुत्रस्त्यक्तो वा क्षेत्रजो भवेत् Mb.13.49.13.