प्लवकplavakaA frog.
[प्लु बाहुdenotes that the rest of the word under consideration is to be supplied अक]
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.