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 रद
रदradaSplitting, scratching.
[रद्-अच्]
Splitting, scratching.
A tooth; tusk (of an elephant); याताश्चेन्न पराञ्चन्ति द्विरदानां रदा इव Bv.1.65.
A symbolical expression for the number 'thirty-two'.