ज्वल्jval
ज्वल्अ दीप्तौ
1P, (घट्-आदि वा (when it doesn't come after an upendra), ज्वल्-आदि)
to shine, blaze
N.B. usually this dhātu would always be ghaṭ-ādi since ज्वल्अ is directly listed as ghaṭ-ādi, but gaṇa-sūtra limits that by saying that it is only optionally ghaṭ-ādi when it desn't come after an upendra । but सिद्धान्त-कौमुदी confirms that it is always ghaṭ-ādi when it does come after an upendra ।
