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 ऊर्ज्
ऊर्ज्ūrjf.Strength, vigour.
[ParasmaipadaIII.2.177]
Strength, vigour.
Sap, juice.
Water.
Food; स देवानपि गच्छति स ऊर्जमुपजीवति Bṛi. Up.1.5.1. Often times with इष्; इषे त्वा ऊर्जे त्वा Ts.1.1.1; इषमूर्जं सुक्षितिम्etc.नम ऊर्ज इषे Bhāg.4.24.38.