सक्थिsakthin.The thigh; (changed in comp. to सक्थ after उत्तर, पूर्व and मृग or when the compound implies comparison; see…
[सञ्ज्-किथन् Uṇ.3.154]
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.