لكث doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• لَكَثَ Form 1

  1 لَكَثَ ذ , [aor. لَكُثَ ,] inf. n. لَكْثٌ (and لِكَاثٌ, IAar), He struck, or smote; (K;) accord. to IAar, who does not particularize the hand, nor the foot: (TA:) or, with his hand, or his foot, accord. to some: (TA:) …

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• لَكْثٌ

  لَكْثٌ ذ The dirt of milk, which congeals upon the edge of the vessel, and is removed with the hand. (TA.)…

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• لَكَثٌ

  لَكَثٌ ذ and (as also نُكَاثٌ, TA,) A disorder in the mouths of camels, resembling pustules. (Lh, K.) -b2- , A disorder that attacks sheep or goats in the sides of the mouth and in the lips, resembling an ulcer; happenin…

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