वनगजमदैः
वन · गज · मद
वनस्य गजाः
तत्पुरुष (genitive) — the elephants of the forest
वनगजानां मदाः
तत्पुरुष (genitive) — and the rut-fluid that runs from them
तत्पुरुष. the ichor of wild elephants — Mallinātha explains why elephants belong in this river: the Vindhya is one of the three ranges elephants come from
uncheckedMallinātha, Sañjīvinī“himavadvindhyamalayā gajānāṃ prabhavā iti vindhyasya gajaprabhavatvāditi bhāvaḥ”