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.
yadakṣaraṁ vedavido vadanti — This supreme Soul is the immutable self-existent Brahman of whom the Veda-knowers speak, and this is that into which the doers of askesis enter when… 8·11
वदन्तिvadantipresent 3rd person plural of the verbal root vad (to say, speak).