Laghukoshasamgraha 13.93

13.93

vaitaraṇī pretanadyāṃ jananyāmamapi rakṣasām |
śaravāṇiḥ śaramukhe padātau śarajīvini ||

vaitaraṇī is the river of the dead, and the mother of the rākṣasas; / śaravāṇi means an arrow-head, a foot soldier, and one who lives by archery;