The Collaborative International Dictionary of English v.0.48:
Seismogram \Seis"mo*gram\, n. [Gr. ? earthquake + -gram.] (Physics) The trace or record of an earth tremor, made by means of a seismograph. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
seismogram n 1: the graphical record of an earth tremor made by using a seismograph