Mi″cro‐seism (?), n. [Micro- + Gr. � an earthquake, fr. � to shake.] A feeble earth tremor not directly perceptible, but detected only by means of specially constructed apparatus. — Mi′cro‐seis″mic (#), ‐seis″mic‐al (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.