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 वर्षणम्
वर्षणम्varṣaṇamRaining, rain.
[वृष्-ल्युट्]
Raining, rain.
Sprinking, showering down (Figurative also); द्रव्यवर्षणम् 'showering or bestowing wealth.