[n] a deep prolonged loud noise
[n] a booming or crashing noise caused by air expanding along the path of a bolt of lightning
[v] utter words loudly and forcefully; "`Get out of here,' he roared."
[v] to make or produce a loud noise; "The river thundered below"; "The engine roared as the driver pushed the car to full throttle."
[v] move fast, noisily, and heavily; "The bus thundered down the road"
[v] be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed"