'Seismograph' definitions:
Definition of 'seismograph'
From: WordNet
noun
A measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake)
Definition of 'Seismograph'
From: GCIDE
- Seismograph \Seis"mo*graph\, n. [Gr. ??? an earthquake + -graph.] (Physics) An apparatus for registering the shocks and undulatory motions of earthquakes. [1913 Webster]