1. thun. der \'th*n-d*r\ n [ME thoner, thunder, fr. OE thunor; akin to OHG thonar] thunder, L tonare to thunder 1a: the sound that follows a flash of lightning and is caused by sudden exp ansion of the air in the path of the electrical discharge archaic 1b: a discharge of lightning : THUNDERBOLT 2: a loud utterance or threat 3: BANG, RUMBLE
2. thunder \-d(*-) rin\ \-d*r-*r\ vb or thun. der. ing 1a: to produce thunder - usu. used impersonally {it ~ed} 1b: to give forth a sound likened to thunder { horses ~ed dow n the road} 2: ROAR, SHOUT 1: to utter loudly : ROAR 2: to strike with a sound likened to thunder - thun. der.er n
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