زلزله doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• زَلْزَلَهُ Form R. Q. 1

  R. Q. 1 زَلْزَلَهُ ذ , (S, * Msb, K, &c.,) inf. n. زَلْزَلَةٌ and زِلْزَالٌ and زَلْزَالٌ and زُلْزَالٌ, (K,) or the first of these is an inf. n. [by universal consent], (S,) and so is the second, but the third is a simp…

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