1. An earthquake register.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sismograph,
• aeismograph,
• zeismograph,
• xeismograph,
• deismograph,
• eeismograph,
• weismograph,
• swismograph,
• ssismograph,
• sdismograph,
• srismograph,
• s4ismograph,
• s3ismograph,
• seismograh,
• siesmograph,
• seismographh,
• ellipseograph,
• seismographc,
• sisemograph,
• cismograph

• seismosaur,
• seismosaurus.

The adjective form of the word "seismograph" is "seismographic".

The plural of the "seismograph" can be the "seismographs".

The singular of the "seismograph" can be the "seismograph".