अवतavataA well, cistern.
[अव-अटच् वेदे पृषो denotes that the rest of the word under consideration is to be suppliedटस्य तः]
A well, cistern.
कोशःDictionaries
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.