a combining form meaning “earthquake,” used in the formation of compound words: seismograph.

see seism, -o- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seismo- or (before a vowel) seism-
combining form
earthquake: seismology
[from Greek seismos]
seism- or (before a vowel) seism-
combining form
[from Greek seismos]

Collins English Dictionary - Complete & Unabridged 10th Edition
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