Search Result for "seismograph": 
Wordnet 3.0

NOUN (1)

1. a measuring instrument for detecting and measuring the intensity and direction and duration of movements of the ground (as an earthquake); 



The Collaborative International Dictionary of English v.0.48:

Seismograph \Seis"mo*graph\, n. [Gr. ??? an earthquake +
   -graph.] (Physics)
   An apparatus for registering the shocks and undulatory
   motions of earthquakes.
   [1913 Webster]


WordNet (r) 3.0 (2006):

seismograph
    n 1: a measuring instrument for detecting and measuring the
         intensity and direction and duration of movements of the
         ground (as an earthquake)