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.
Entry चीर्ण
चीर्णcīrṇaa.(चर्-नक् पृषो˚ अत ईन्वम्]
(चर्-नक् पृषोdenotes that the rest of the word under consideration is to be suppliedअत ईन्वम्]