What does "seismograph" mean?

An instrument that automatically detects and records the intensity, direction and duration of earthquakes and similar events.

How do you pronounce "seismograph"?

Pronounced //ˈsaɪz.mə.ɡɹæf//.

Common synonyms include: earthquake recorder, earthquake trace, instrument, oscilloscope, recording instrument, seismogram.

/ˈsaɪz.mə.ɡɹæf/ noun

noun ·Rare ·Advanced level

Noun

1
An instrument that automatically detects and records the intensity, direction and duration of earthquakes and similar events.
2
a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake) wordnet

From seismo- + -graph.