What do a.m. and p.m. stand for?


[sahyz-muh-gram, sahys-] /ˈsaɪz məˌgræm, ˈsaɪs-/
a record made by a seismograph.
Origin of seismogram
1890-95; seismo- + -gram1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for seismogram
  • Click on a red seismogram icon or a region on list at right.
  • Based on the duration of shaking as measured by the time decay of the amplitude of the seismogram.
  • During an earthquake the ground shakes and that is recorded as a seismogram.
  • The seismogram charts nine minutes of the earthquake in its varying intensities.
  • These spectrogram displays depict the frequency content of a seismogram as it changes with time, updated once per minute.
Word Origin and History for seismogram

record made by a seismograph or seismometer, 1888, from seismo- + -gram.

Online Etymology Dictionary, © 2010 Douglas Harper
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seismogram in Science
The record that is produced by a seismograph.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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