Etymology
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temblor (n.)

"earthquake," 1876, from American Spanish temblor "earthquake," from Spanish temblor, literally "a trembling," from temblar "to tremble," from Vulgar Latin *tremulare (see tremble (v.)).

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tremblor (n.)

"earthquake," 1913, alteration of temblor, by influence of trembler, agent noun of tremble (v.).

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