Valmiki Ramayana Yuddha Kanda Sarga 67 Shloka 170

सः that, महापर्वतकूटसन्निभम् lofty peak of a mountain, विवृत्तदंष्ट्रम् distinguished by large pointed teeth, चलचारुकुण्डलम् shaking ear rings, रक्षोधिपतेः Rakshasa king, शिरः head, तदा then, पुरा earlier, पुरन्दरः Indra, वृत्रस्य Vritasya, यतैव like that, चकर्त severed.

The arrow (of Rama) severed the head of Rakshasa king whose body was like a lofty mountain peak, whose teeth were large and protruded, hanging earrings shaking, just as Indra severed the head of Vritasura earlier.