vaj (prob. corrupted fr. √vraj), cl. 1. P. vajati (pf. vavāja fut. vajitā &c., Gr.), to go Dhātup. vii, 78: Caus. or cl. so. P. vājayati, to prepare the way to trim or feather an arrow (mārga-, or mārgaṇa-saṃskâre) Dhātup. xxxii, 74. Another √vaj or uj, 'to be hard or strong', may be inferred from ugra, ojas, vajra, vāja (qq. vv.), the last of which gave rise to the Nom. vājaya, q.v. [For cognate words See under ugra and ojas.]

Sanskrit-English Dictionary, by M. Monier William