Meaning

noun a deep prolonged loud noise

noun a booming or crashing noise caused by air expanding along the path of a bolt of lightning

noun street names for heroin

originFrom Middle English thunder, thonder, thundre, thonre, thunnere, þunre, from Old English þunor (“thunder”), from Proto-West Germanic *þunr, from Proto-Germanic *þunraz, from Proto-Indo-European *(s)ten-, *(s)tenh₂- (“to thunder”). Compare astound, astonish, stun. Germanic cognates include West Frisian tonger, Dutch donder, German Donner, Old Norse Þórr (English Thor), Danish torden, Norwegian…

Etymology from Wiktionary, CC BY-SA 3.0