You searched for: “auxographs”
auxograph (s) (noun), auxographs (pl)
An auxograph is an instrument that records variations in the volume or degree of loudness of sounds.
This entry is located in the following units: aug-, auc-, auct-, auxano-, auxi-, aux-, auxo- (page 3) grapho-, graph-, -graph, -graphy, -grapher, -graphia (page 8)