- a combining form meaning “earthquake,” used in the formation of compound words: seismograph.
Origin of seismo-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
before a vowel seism-
from Greek seismos
Word Origin and History for seismo-
word-forming element meaning "earthquake," from comb. form of Greek seismos "a shaking, shock; an earthquake," from seiein "to shake," from PIE root *twei- "to agitate, shake, toss."
Online Etymology Dictionary, © 2010 Douglas Harper