viadrum
viadrum is a term that can refer to a few different things, primarily related to music and rhythmic devices. One common interpretation is a drum that is played using a viaduct or bridge-like structure. This might involve a drummer positioned beneath a large overpass or bridge, with their drum kit mounted above, allowing them to play down onto the instrument. The acoustics of such a setup could create a unique sound.
Another possible meaning relates to a specific type of drum or percussive instrument. In some experimental
The term could also be a portmanteau, blending "via" (meaning "by way of" or "road") with "drum."