From Hindupedia, the Hindu Encyclopedia
By M. A. Alwar
Irammadaḥ is a masculine form.
It is derived from "irayā udakena mādyati dīpyate abindhanatvāt" which means 'That which burns by water, by virtue of having water as fuel'.
Grammatically it can be split as irā+mad+khaś. The affix and mum augment is given by nipātana by the rule ugrampaśyerammadapāṇindhamāśca.
Ugrampaśyerammadapāṇindhamāśca refers to lightning. The flash following thunderbolt.
Synonyms of Irammadaḥ are:
Usage in Bharata
"It is the fire which flows out of clouds due to friction with each other, and falls on trees, etc. It also includes fire born in the air"
- Shabdakalpadrumah by Raja Radhakantdev, Varadaprasada Vasu, Haricarana Vasu