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 मर्क
मर्कmarkaa.Ved.
Vedic
Cleaning, purifying.
Perishing, dying away.
Derived forms and compounds
-र्कः
The vital breath, life-wind.
An ape, a monkey; मर्कान् भोक्ष्यन् विभजति स चेन्नात्ति भाण्डं भिनत्ति Bhāg.1.8.29.