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.
tejomayaṁ viśvamanantamādyaṁ — The Blessed Lord said:- This that thou now seest by my favour, O Arjuna, is my supreme shape, my form of luminous energy, the universal, the infinite… 11·47
तेजोमयम्tejomayamaccusative singular of the neuter form of the adjective tejomaya (full of luminous energy).