The word 'thundershower' is a transparent compound formed from two native English elements, 'thunder' and 'shower'. 'Thunder' originates from the Proto-Germanic þunraz, which is itself likely derived from the Proto-Indo-European root (s)tenh₂-, meaning "to thunder" or "to roar". 'Shower' comes from the Proto-Germanic skūrō, a word for a storm or shower. The compound logically and descriptively names a meteorological event by combining the auditory phenomenon (thunder) with the type of precipitation (a brief, heavy shower), creating a precise term for a common summer storm.

Structure: thunder (loud noise in a storm) + shower (brief fall of rain) - thunder: From Old English þunor, meaning the loud rumbling or crashing noise heard after a lightning flash. It is of Germanic origin, related to Dutch donder and German Donner. - shower: From Old English scūr, meaning a short period of rain or fall of things. It is of Germanic origin, related to Dutch schoer and German Schauer.