thaneti

to roar, to thunder DN.ii.262; SN.i.100, SN.i.154 (megho thanayaṃ), SN.i.154 (thaneti devo) Iti.66 (megho thanayitvā)
pp thanita. See also gajjati & thunati.

Vedic stanayati & stanati to thunder; cp. Gr. στένω, στενάζω to moan, groan, στονος; Lat. tono; Ags stunian; Ger. stöhnen