One of the mysteries of the English language finally explained.
An earthquake, as opposed to an imperceptible earth tremor. Formerly also (in Milne's use): †a major earthquake that involved the ‘nucleus’ of the earth as well as its crust (obsolete).
Early 20th century; earliest use found in James Milne (b. 1865). From macro- + seism, partly after French macroséisme.
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